needs a lot of work still
it looks like you put a TON of work into it, but that's like how Call of Duty 3 got an E for Effort. spend less time on the artistic stuff and more time on the gameplay. i felt like i was playing Metroid fusion on my GBA and the camera was moving like it does in Super Smash Bros...... except the GBA was lagging REALLY REALLY BADLY. like others have already said, this camera dilema is making it hard for the game to flow. plus, when there aren't any enemies on the screen all i see is me, AND THAT'S IT, NOTHING ELSE. it's a bit hard to make that leap of faith when i can't see 3-4 feet in front of me.
also, i see you put in a reward type gun upgrade thing. great, i find that a good part of the game, TOO BAD THE SECOND UPGRADE WON'T LET YOU SHOOT STRAIGHT. when i'm shooting some shots up and some down in a V shape, it make it REALLY hard to kill the mean floaty thing that's shooting me right in front of my face =_= try to make that upgrade system a bit more rewarding, like faster rate of fire or greater damage each shot.
now get to work.