It could be a good game, it has great potential. Here are some ideas:
1) The graphics were nice, but could've been better.
2) Some instructions and aspects were rather sketchy, and made little sense at first.
3) Perhaps an option that could help is the option to choose what your character looks like from a preset collection, this would help ease some of the newground's population's issues with the devil character (add an angel perhaps? Some veteran NGers might also recognize an angreh faic >:D).
4) Also, was level 7 engineered to cause epilepsy? You may not realize it, but all those flashes and colors flying around the screen could easily trigger epilepsy in somebody, and you could land in a heap of trouble for not putting a warning anywhere in-game or in the page. You have to consider these things.
5) The gameplay and concept were both nice, and with some more exploration into the subject, you could make a great game.
Anyways, keep up the good work, and I hope you make another! :D