Gun Orphan I really love these types of fast paced shooter games, and you really nailed the fast part of it, i also like unforgiving too. But you seem to have found a balance between forgiving and unforgiving by having enough lives but having hard control over your speed.
Overall, took me 20 minutes to beat the normal difficulty. Music gets an excellent brownie point as well. Good job!
EDIT: Beaten hard mode, took approximately 25 minutes this time. Like it!