two words CHECK POINTS!!!
I would kill to have a checkpoint, i cant stand replaying entire levels.
with that out of the way nice game.
very original idea. thats a definate plus, people tend to not be original (look at all the ng dress-up games and stick movies, not to mention random crap)
maybe for future games dont disable the right-click menu, people (like me) like to be able to zoom in and check out detail and stuff
umm, move the background and foreground at different speeds, throw in a little more scenery
and difficulty levels, slow, medium and fast.
See the thing is, simple games like this are ok, but if its going to be simple you have to put more into other areas, like graphics, options, easter eggs. you could have had the koopas in there, the guys with the black shells, fish. Just stuff to think of for the sequel, cause i know you're going to make one. you better.