I really like your game. The look of the game and the animations are good and instead of overloading the game with too much mechanics, you focused on just a few, which is great because this makes your game so solid.
Beside the points Team404 mentioned, I have one other point to mention: Sometimes the character didn't jump, when I pressed the button. Maybe it happens when I pressed several buttons at the same time. I wasn't really able to figure it out. Because of this I died a few times and this was a little bit frustrating. Maybe you can take a look into this.
Keep up the good work!