projectile lifetime

Entities/Projectile.cs

@@ -17,8 +17,19 @@ namespace SupaLidlGame.Entities
         [Export]
         public Hitbox Hitbox { get; set; }
 
+        [Export]
+        public double Lifetime { get; set; } = 10;
+
         public Character Character { get; set; }
 
+        public override void _Process(double delta)
+        {
+            if ((Lifetime -= delta) <= 0)
+            {
+                QueueFree();
+            }
+        }
+
         public override void _PhysicsProcess(double delta)
         {
             Vector2 velocity = Velocity;