Fun game! I noticed that the first three levels are quite laggy (I don't have a great machine), to the point where they were almost unplayabled. I can't say for sure, but I believe this was because of the parallax background. There is also no way to get back to the main menu when playing a level other than to beat it, so on level three because I couldn't return to the main menu to change the level, I had to close the game. Although, that isn't a big deal because the game does boot up really fast.
All that aside, it's a really fun game, with slightly weird wonky controls. Maybe you can add a setting some time in a more updated version of this game with the option to disable the parallax background?
Anyways, thanks for the awesome fun experience, it was a short little game that was very creative and very humble!