Two things, which are actually just one;
First one: The screen is sooooooo small I wasnt able to see clearly, sorry but you should have seen this when you tested your game. Next time add a bigger size plz!! =)
Second one: The game lagged every 2 or 3 seconds. Since I havent seen anyone complaining about this i guess it's my PC's fault sooooo no problemo. But it's a pity since i was enjoying it very much until the rockets stage in 2º world, it was impossible to success cuz u know when it lagged, inmediately after the rockets fired twice as fast and my character moved also as twice as normal...
Anyway, great idea, at first i thought this was a labrynth game, playing with magnets and stuff. But this was great too, its been fun!