Nice, I have tried it, here is what I think:
-when u get to the second boss, put somewhere instructions that u can shoot up while holding the up arrow, maybe i missed it, i dunno, but put it again because i was dodging him for hours without shooting him xD.
-the difficulty is great, it gets gradually harder

-there was no music or sound effects. I dont know if it is a problem of my comp, or that you dont have put any yet

. you can try this to make some sound effects
http://www.superflashbros.net/as3sfxr/When i died at one of the bosses, it put me back at the last boss i defeated, and there is where i quited xD. On easy mode it should bring you back to the same boss or something I think
