Identified @export variables as int, float and the game started again!

player.gd

@@ -5,8 +5,8 @@ signal damage_taken
 # signal shield_damage
 # signal shield_ui
 
-@export var speed = 150
-@export var cooldown = 0.25
+@export var speed: int = 150
+@export var cooldown: float = 0.25
 @export var bullet_scene : PackedScene
 @export var max_shield: int = 10
 var shield: int = max_shield:
@@ -17,9 +17,8 @@ var shader_active = false
 
 @onready var screensize = get_viewport_rect().size
 @onready var explosion = $Explosion
-@onready var gun_cooldown = $GunCooldown
+@onready var wait_time = $GunCooldown
 @onready var ship = $Ship
-@onready var cooldown_timer = $CooldownTimer
 
 func _ready():
     start()
@@ -49,18 +48,21 @@ func _process(delta):
 
 func shoot():
     if not can_shoot:
-        return
+      return
     can_shoot = false
     $GunCooldown.start()
     var b = bullet_scene.instantiate()
     get_tree().root.add_child(b)
     b.start(position + Vector2(0, -8))
+    var tween = create_tween().set_parallel(false)
+    tween.tween_property($Ship, "position:y", 1, 0.1)
+    tween.tween_property($Ship, "position:y", 0, 0.05)
 
 func set_shield(value: int):
     var old_value: int = shield
     shield = min(max_shield, value)
     EventBus.shield_changed.emit(max_shield, old_value, shield)
-   # shield_damage.emit()
+    # shield_damage.emit() # Don't need this anymore since switching to event_bus.gd
     if shield <= 0:
         set_process(false)
         $Ship.hide()