Fixed placeholder texture. Added correct ship movement

game/entities/ship.gd

@@ -1,9 +1,44 @@
 extends Node2D
 
-@export var size : Vector2
+@export var size : Vector2:
+	set(value):
+		size = value
+		if $Sprite2D.texture:
+			$Sprite2D.texture.size = value
+	get:
+		return size
+
+@export var acceleration : int
+@export var deceleration : int
+@export var max_speed : int
+
+var _velocity : Vector2
 
 
 func _ready() -> void:
 	var texture := PlaceholderTexture2D.new()
 	texture.size = size
 	$Sprite2D.texture = texture
+
+
+func _process(delta: float) -> void:
+	position += _velocity * delta
+
+
+func accelerate(value: Vector2) -> void:
+	_velocity += value
+	_velocity = _velocity.clamp(Vector2(-max_speed, -max_speed), Vector2(max_speed, max_speed))
+
+
+func decelerate(value: float) -> void:
+	var current_speed := _velocity.length()
+	
+	if current_speed <= 0:
+		_velocity = Vector2.ZERO
+		return
+	
+	var new_speed := current_speed - value
+	if new_speed < 0:
+		new_speed = 0
+	
+	_velocity = _velocity.normalized() * new_speed