It's ok...
You should really consider testing it before you release it. I tried different thing trying to get trough different entrances that were too small just to get in while jumping. You should try what capcom did with megaman x. You had a wall slide, but that let's you get in to entrances on walls. It became so frustrating in some levels to be stuck for a simple design error that could have being avoided with proper testing of the game. Moreover, I read some reviews below of people experiencing the same problem.
It's a decent entertaining easy game to play, but seriously fix that and change the annoying boring song, and I think you will have a decent game for people to play.
YOU SCORE A 2!