It was pretty good
You managed quite good on such used-up genre, the gameplay was smooth most of the time, and the extremely low amount of glitches does make it stand out.
The pros are quite obvious; loads of weapons, excellent graphs and a hellova variety of enemies and tactics, the feeling of graduating difficulty. I also liked that if you get hit the rage bar shoots up a bit, makes the game a bit easier.
But like every game, cons stand out way more than the pros.
The running furballs are very very annoying, if you get knocked down then you're pretty much dead. Same with miners, if they trap you, you're dead.
The poison flies are annoying, as they poison you if they touch you and poison is very overpowered imo. Then theres levels which are easy once you find the right tactic, but annoying and repetitive (17).
Oh yeah and the big weapons are useless.
Nice game, but little factors make it very annoying. Waiting for the sequel ! :>