I really like this game it's very simple but it works well! I do have some suggestions. So, I'm guessing you've used Godot for this project, but if not you can find your engine's specific way of fixing it. If not that's alright!
- Diagonal movement is fast: I'm not sure if it's a feature you've decided to include but, if you press W+D it's faster than just pressing D or W.
var Direction : Vector2 = Input.get_axis("A", "D", "W", "S").normalized()
2. Music: I'm not sure if you've made it louder, but during the later levels the music kept getting louder and louder.
These are just some minor issues, but I still enjoyed the game, it was really fun to play. Wish you the best!