Very basic, but playable.
Positive:
I like how the stages get darker as you progress. It makes the game more challenging. The controls work as they should and the game is playable.
Negative:
Way too basic. Needs more detail to the background and platforms. Keep music in the later levels as well. Having to restart the level because you jumped too high is annoying.
Needs improvement, but you got the potential. 5/10