Added basic monster spawners

Assets/Prefabs/Arena.prefab

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Assets/Scripts/Arena Stats.asset

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Assets/Scripts/Arena.cs

@@ -1,18 +1,43 @@
+#nullable enable
 using System.Collections;
-using System.Collections.Generic;
 using UnityEngine;
 
-public class Arena : MonoBehaviour
+public class Arena : MonoBehaviour {
-{
+	//TODO probably add initial direction too
-    // Start is called before the first frame update
+	[SerializeField] Vector3[] spawners = null!;
-    void Start()
+	[SerializeField] ArenaStats stats = null!;
-    {
+	[SerializeField] GameObject monsterPrefab = null!;
-        
-    }
 
-    // Update is called once per frame
+	SafeZone safeZone = null!;
-    void Update()
+	
-    {
+	void Awake() => safeZone = GetComponentInChildren<SafeZone>();
-        
+
-    }
+	void Start() => StartCoroutine(SpawnEnemies());
-}
+
+	void SpawnEnemy(int spawnerIndex) {
+		var monster = Instantiate(monsterPrefab, spawners[spawnerIndex], Quaternion.identity).GetComponent<Monster>();
+		//TODO Replace hardcoded target with entity discovery
+		monster.SetTarget(safeZone.transform);
+	}
+
+	IEnumerator SpawnEnemies() {
+		yield return new WaitForSeconds(stats.secondsBetweenSpawners);
+		
+		int currentSpawner = 0;
+		
+		//TODO Stop when pause/end game
+		while (true) {
+			SpawnEnemy(currentSpawner);
+			currentSpawner = Random.Range(0, spawners.Length);
+			yield return new WaitForSeconds(stats.secondsBetweenSpawners);
+		}
+	}
+
+#if UNITY_EDITOR
+	void OnDrawGizmosSelected() {
+		Gizmos.color = Color.blue;
+		foreach (Vector3 spawner in spawners)
+			Gizmos.DrawWireCube(spawner, Vector3.one);
+	}
+#endif
+}

Assets/Scripts/ArenaStats.cs

@@ -0,0 +1,6 @@
+using UnityEngine;
+
+[CreateAssetMenu]
+public class ArenaStats : ScriptableObject {
+	[Min(0f)] public float secondsBetweenSpawners = 3f;
+}

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Assets/Scripts/PlayerMovement.cs

@@ -4,20 +4,16 @@ using UnityEngine.InputSystem;
 
 [RequireComponent(typeof(PlayerInput), typeof(Rigidbody2D))]
 public class PlayerMovement : MonoBehaviour {
-	[SerializeField] PlayerStats playerStats;
+	[SerializeField] PlayerStats playerStats = null!;
-	Rigidbody2D rb;
+	Rigidbody2D rb = null!;
 	
-	PlayerInput playerInput;
 	Vector2 moveDirection;
 	BaseState currentState = new ImmobileMovementState();
 	SafeZone? safeZone;
 
 	bool lastJumpButton;
 
-	void Awake() {
+	void Awake() => rb = GetComponent<Rigidbody2D>();
-		rb = GetComponent<Rigidbody2D>();
-		playerInput = GetComponent<PlayerInput>();
-	}
 
 	void FixedUpdate() {
 		if (currentState.FixedUpdateState(this) is {} newState)