Organization of Game Files

Created folder for C# files, player, and enemy so it's a little cleaner...

Assets/C# Scripts/GameState.cs

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+using UnityEngine;
+
+public class GameState : MonoBehaviour
+{
+	public State state;
+	public uint wave;
+	public GameObject ratbot;
+	public GameObject shop;
+	void Start() {
+		OpenShop();
+	}
+
+	public enum State {
+		Wave,
+		Shop,
+		Menu,
+		Paused,
+	}
+
+    // Update is called once per frame
+    void Update()
+    {
+        if (GameObject.FindGameObjectsWithTag("Ratbot").Length == 0 && state == State.Wave) {
+			OpenShop();
+		}
+    }
+	void OpenShop() {
+		state = State.Shop;
+		Instantiate(shop);
+	}
+	public void NewWave() {
+		// Close the shop
+		Destroy(GameObject.FindGameObjectWithTag("Shop"));
+		// Spawn ratbots around the player
+		// Amount, health, and damage scale with waves
+		state = State.Wave;
+		Vector3 playerPosition = GameObject.FindGameObjectWithTag("Player").transform.position;
+		for (uint _ = 0; _ <= wave; _++) {
+			GameObject newRatbot = Instantiate(
+				ratbot,
+				Random.insideUnitCircle.normalized*20,
+				Quaternion.identity
+			);
+			newRatbot.GetComponent<Ratbot>().damageStrength = 5+wave*5;
+			newRatbot.GetComponent<Ratbot>().health = 5+wave*2;
+		}
+		wave++;
+	}
+}