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index 2d54142..8e5eead 100644
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diff --git a/Assets/Prefabs/baseProjectile.prefab b/Assets/Prefabs/baseProjectile.prefab
index d4f38b5..d4266db 100644
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index d94682c..f53fbef 100644
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diff --git a/Assets/Scenes/Game.unity b/Assets/Scenes/Game.unity
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+    - target: {fileID: 8434244523906479734, guid: e20680474d73eee49836ff9cbc6d0b28, type: 3}
+      propertyPath: _food
+      value: 5
+      objectReference: {fileID: 0}
+    - target: {fileID: 8434244523906479734, guid: e20680474d73eee49836ff9cbc6d0b28, type: 3}
+      propertyPath: _prefab
+      value: 
+      objectReference: {fileID: 5157279992115123224, guid: 85534a2d6c2add54d864073914646192, type: 3}
+    m_RemovedComponents: []
+  m_SourcePrefab: {fileID: 100100000, guid: e20680474d73eee49836ff9cbc6d0b28, type: 3}
+--- !u!224 &794776829 stripped
+RectTransform:
+  m_CorrespondingSourceObject: {fileID: 907652127959947829, guid: e20680474d73eee49836ff9cbc6d0b28, type: 3}
+  m_PrefabInstance: {fileID: 794776828}
+  m_PrefabAsset: {fileID: 0}
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   m_ObjectHideFlags: 0
@@ -1734,7 +2192,7 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 907652127959947829, guid: e20680474d73eee49836ff9cbc6d0b28, type: 3}
       propertyPath: m_RootOrder
-      value: 1
+      value: 2
       objectReference: {fileID: 0}
     - target: {fileID: 907652127959947829, guid: e20680474d73eee49836ff9cbc6d0b28, type: 3}
       propertyPath: m_AnchorMax.x
@@ -2476,7 +2934,7 @@ PrefabInstance:
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     - target: {fileID: 907652127959947829, guid: e20680474d73eee49836ff9cbc6d0b28, type: 3}
       propertyPath: m_RootOrder
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       propertyPath: m_AnchorMax.x
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   m_PrefabInstance: {fileID: 1217068628}
   m_PrefabAsset: {fileID: 0}
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+RectTransform:
+  m_CorrespondingSourceObject: {fileID: 907652128235033330, guid: e20680474d73eee49836ff9cbc6d0b28, type: 3}
+  m_PrefabInstance: {fileID: 1217068628}
+  m_PrefabAsset: {fileID: 0}
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 GameObject:
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diff --git a/Assets/Scripts/Ally/Harvester.cs b/Assets/Scripts/Ally/Harvester.cs
new file mode 100644
index 0000000..6f236e0
--- /dev/null
+++ b/Assets/Scripts/Ally/Harvester.cs
@@ -0,0 +1,6 @@
+using UnityEngine;
+using System.Collections.Generic;
+
+public class Harvester : Entity 
+{
+}
\ No newline at end of file
diff --git a/Assets/Scripts/Ally/Harvester.cs.meta b/Assets/Scripts/Ally/Harvester.cs.meta
new file mode 100644
index 0000000..b319121
--- /dev/null
+++ b/Assets/Scripts/Ally/Harvester.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: c0051e3c39a18654fbc359fd2353010f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/Drag&Drop/GameObjectPlacementButton.cs b/Assets/Scripts/Drag&Drop/GameObjectPlacementButton.cs
index 52e74a1..1662b25 100644
--- a/Assets/Scripts/Drag&Drop/GameObjectPlacementButton.cs
+++ b/Assets/Scripts/Drag&Drop/GameObjectPlacementButton.cs
@@ -10,9 +10,9 @@ public class GameObjectPlacementButton : UnitPlacementButton
         var instance = Instantiate(_prefab);
 
         //we need to fetch the detection size before stripping the object
-        var detectComp = instance.GetComponentInChildren<Detection>();
+        var detectComp = _prefab.GetComponentInChildren<Detection>();
         Rect detectionRect = default;
-        if(detectComp) detectionRect = instance.GetComponentInChildren<Detection>().DetectionRectangle;
+        if(detectComp) detectionRect = _prefab.GetComponentInChildren<Detection>().DetectionRectangle;
 
         //strip the object
         foreach (var r_body in instance.transform.GetAllComponents<Rigidbody2D>()) Destroy(r_body);
diff --git a/Assets/Scripts/Drag&Drop/ObjectPlaceholder.cs b/Assets/Scripts/Drag&Drop/ObjectPlaceholder.cs
index 20da1a5..862c775 100644
--- a/Assets/Scripts/Drag&Drop/ObjectPlaceholder.cs
+++ b/Assets/Scripts/Drag&Drop/ObjectPlaceholder.cs
@@ -10,9 +10,10 @@ public class ObjectPlaceholder : DraggablePlaceholder
     public override bool CanBePlacedHere()
     {
         var objsOnPosition = LevelManager.Instance.GetAll<ILevelObject>(obj => obj.Position.IsContainedIn(transform.position));
-        var positionContainsFarm = objsOnPosition.Exists(obj => obj.Name.ToLower().Contains("farm"));
+        var positionIsCollidable = objsOnPosition.Exists(obj => obj.IsCollidable);
 
-        //either no object, or object is farm
-        return objsOnPosition.Count == 0 || (objsOnPosition.Count == 1 && positionContainsFarm);
+        return !positionIsCollidable 
+            && _lvlBoundsCache.Contains(transform.position)
+            && ResourceManager.Instance.EnoughFor(Rock, Wood, Food);
     }
 }
\ No newline at end of file
diff --git a/Assets/Scripts/LevelManager/LevelManager.cs b/Assets/Scripts/LevelManager/LevelManager.cs
index ff1e4f4..90af965 100644
--- a/Assets/Scripts/LevelManager/LevelManager.cs
+++ b/Assets/Scripts/LevelManager/LevelManager.cs
@@ -98,8 +98,6 @@ public class LevelManager : Singleton<LevelManager>
 
     public void UpdateLevel()
     {
-        _levelObjects.ForEach(levelObject => levelObject.LevelUpdate());
-
         var toAdd = new List<ILevelObject>(_toAdd);
         toAdd.ForEach(addedObject =>
         {
@@ -115,7 +113,27 @@ public class LevelManager : Singleton<LevelManager>
             _levelObjects.Remove(removedObject);
             removedObject.LevelDestroy();
         });
-        toRemove.Clear();
+
+        _levelObjects.ForEach(levelObject =>
+        {
+            levelObject.LevelUpdate();
+        });
+
+        toAdd = new List<ILevelObject>(_toAdd);
+        toAdd.ForEach(addedObject =>
+        {
+            _toAdd.Remove(addedObject);
+            _levelObjects.Add(addedObject);
+            addedObject.LevelStart();
+        });
+
+        toRemove = new List<ILevelObject>(_toRemove);
+        toRemove.ForEach(removedObject =>
+        {
+            _toRemove.Remove(removedObject);
+            _levelObjects.Remove(removedObject);
+            removedObject.LevelDestroy();
+        });
     }
 
     public void ClearLevel()
diff --git a/Assets/Scripts/LevelManager/LevelObject.cs b/Assets/Scripts/LevelManager/LevelObject.cs
index 8f39210..11df92f 100644
--- a/Assets/Scripts/LevelManager/LevelObject.cs
+++ b/Assets/Scripts/LevelManager/LevelObject.cs
@@ -10,7 +10,14 @@ public abstract class LevelObject : MonoBehaviour, ILevelObject
     public Vector3 Position { get => transform.position; protected set => transform.position = value; }
     public string Name { get => name; protected set => name = value; }
 
-    public bool IsCollidable => GetComponent<Collider2D>();
+    public bool IsCollidable
+    {
+        get
+        {
+            var collider = GetComponent<Collider2D>();
+            return collider && !collider.isTrigger;
+        }
+    }
 
     void Awake()
     {
diff --git a/Assets/Scripts/Tiles/ResourceTile.cs b/Assets/Scripts/Tiles/ResourceTile.cs
index a92eecf..3352985 100644
--- a/Assets/Scripts/Tiles/ResourceTile.cs
+++ b/Assets/Scripts/Tiles/ResourceTile.cs
@@ -21,6 +21,11 @@ public class ResourceTile : LevelTile
 
     public override void LevelUpdate()
     {
+        //check if there is an harvester unit on top
+        var hasFarmer = LevelManager.Instance.Get<Harvester>(x => x.Position.IsContainedIn(Position));
+        if (!hasFarmer) return;
+
+
         _yieldCounter += Time.deltaTime * _yieldSpeed;
         if (_yieldCounter < 1) return;
         if(_yieldPrefab != null)
diff --git a/ProjectSettings/TagManager.asset b/ProjectSettings/TagManager.asset
index 190f104..c3fcd7d 100644
--- a/ProjectSettings/TagManager.asset
+++ b/ProjectSettings/TagManager.asset
@@ -44,9 +44,12 @@ TagManager:
   - name: paysage
     uniqueID: 436725303
     locked: 0
+  - name: Tiles
+    uniqueID: 2009948983
+    locked: 0
   - name: Default
     uniqueID: 0
     locked: 0
-  - name: Character
+  - name: Unit
     uniqueID: 364159097
     locked: 0