Add bullet shooting mechanics and refactor scenes

scenes/player.gd

@@ -1,8 +1,31 @@
 extends Area2D
 
 @export var speed = 150
+@export var cooldown = 0.25
+@export var bullet_scene : PackedScene
+var can_shoot = true
+
 @onready var screensize = get_viewport_rect().size
 
+func _ready():
+    start()
+
+func start():
+    position = Vector2(screensize.x / 2, screensize.y - 64)
+    $GunCooldown.wait_time = cooldown
+
+func shoot():
+    if not can_shoot:
+        return
+    can_shoot = false
+    $GunCooldown.start()
+    var b = bullet_scene.instantiate()
+    get_tree().root.add_child(b)
+    b.start(position + Vector2(0, -8))
+
+func _on_gun_cooldown_timeout():
+    can_shoot = true
+
 func _process(delta):
     var input = Input.get_vector("left", "right", "up", "down")
     if input.x > 0:
@@ -17,3 +40,5 @@ func _process(delta):
     position += input * speed * delta
     position = position.clamp(Vector2(8, 8), screensize-Vector2(8, 8))
 
+    if Input.is_action_pressed("shoot"):
+        shoot()