Nice platformers are hard. I know, I tried to make one.... And I failed... But this is pretty good. keep it up and you could make a really cool game. PS: Make the guy faster and jump higher. He is too slow.
Good effects... But suprisingly boring. I think it is because there isn't really much user interaction, you just sit there and move the mouse and the game does the rest. It should be a spacebar shooter, and I think the FPS needs to be higher. Overall, a good game.