Although very simple, I think the graphics and music are very good and fit nicely. I also like the idea of your upgrades being extra jumps, you could make interesting map layouts and challenges around that.
Sadly, the character movement being so slow really drags down the game. I think you can have that speed in a game, but mixed with upgrades that improve your jumps, and your jump being so fast and high by its own, it makes the overall movement feel bad.
Still, it was an okay entry, and I didn't find bugs at all, so nice job!