not a bad game.
Fun and easy graphics. Also, the difference between a platform I can pass through or not is also visible and, not to forget the fun action of entering a coin at the beginning.
I have some tips for you if you like them.
-create some more control over where you jump sometimes I have to do it on pixel perfect level.
-als in level design place your enemies where I can see them. I had in level two I jumped too high and didn't notice there was an enemy right above me and thus my character died.