Whoa, this is actually a really well-made game!
I had pretty low expectations because of the art from the thumbnail (so I almost didn't click on it), but the audio+sfx and technical implementation are really great! If you can find an artist to work with you on improving the UI and characters, I think this game would have heaps of players!
It's really amazing you made this in 48 hours.
I'd suggest somehow incorporating the drawing part into the game thumbnail.