Loved playing this. I have played it a couple times now. And I have convinced several friends to give it a try too.
I really hope you are still working on this. I understand it is still only a prototype. But if you proceed, I think you have a great idea here. The character is cute, the gameplay is relaxed and retro. And the levels are interesting.
If you continue work on this; here is my wishlist. :)
*A start menu.
*More levels (obviously.lol)
*Allow custom keybindings.
Other than that, keep it delightfully simple and I wish you the best!