Here's your problem.
The screen shakes worse than Michael J. Fox on a bad day. Couple that with the fact that enemy units look exactly like the fragments they blow up into, and the game is trippin' balls with your mind.
The game reminds me of Frantic 2, basically focus on dodging more than killing/destroying.
The music is pretty good. Graphics are intense, great job.
When I died, there was no point of even trying to survive when I found out my shooter level decreased drastically. I had basically survived long enough from killing my enemies while dodging their attacks - after being killed one time, the enemies started piling up on the screen, increasing the attacks two-fold. In other words, after you die, the difficulty is multiplied in the very least. It's nigh impossible to continue playing successfully, much less surviving for very long after the first defeat.
One thing you should consider is disabling the "trailing" or "ghosting" effect everything has. It cuts down on the bullshit and flashy stuff and lets the player focus on the game more.