Some things

Assets/Scripts/Level 1/Bullet1.cs

@@ -0,0 +1,16 @@
+using UnityEngine;
+
+namespace Level1 {
+    public class Bullet1 : MonoBehaviour {
+        [SerializeField] float speed;
+
+        public void AddForce(int direction) {
+            Rigidbody2D rb = GetComponent<Rigidbody2D>();
+            rb.velocity = Vector2.right * direction * speed;
+        }
+
+        void OnCollisionEnter2D(Collision2D other) {
+            Destroy(gameObject);
+        }
+    }
+}