This is pretty nice and challenging, especially in the end, but how am I supposed to kill the final boss? After running past him (facing him head-on would simply be suicide because there's no way to dodge or duck his shots), I unloaded hundreds of rounds into him from behind and yet he wouldn't go down. After seeing how useless my rounds were, I simply destroyed the last big thing thus beating the game. You still did a pretty good job making this though.