start work on implementing gameplay

Assets/Scripts/Projectile.cs

@@ -0,0 +1,31 @@
+using UnityEngine;
+
+public class Projectile : MonoBehaviour
+{
+	[SerializeField] private Rigidbody2D rb;
+	public int damage;
+	public float speed;
+	public float lifetime;
+	public Vector2 direction;
+
+
+	private void Start()
+	{
+		Destroy(gameObject, lifetime);
+		direction = transform.right;
+	}
+
+	private void FixedUpdate()
+	{
+		rb.linearVelocity = direction * speed;
+	}
+
+	private void OnTriggerEnter2D(Collider2D other)
+	{
+		if (!other.CompareTag(tag) && other.TryGetComponent(out Entity isEntity))
+		{
+			isEntity.TakeDamage(damage);
+			Destroy(gameObject);
+		}
+	}
+}