A cool little game! I thought that creating an 'energy' mechanic was quite innovative and I liked the added challenge it gave to completing levels in time. That and the raining fireballs were very cool. As others said the music is really awesome, and while I see you've collected assets from all over the place you've done a great job of assembling them in such a way that you create an environment that seems to just 'fits' together so nicely - it really feels great. Great job!