First start I was getting a power up showing up every 10 seconds. Then (after dying), a power up would show up once per minute. Why such a huge range in power-up random show up?
For a game of this type (IE: shit load of enemies spamming you), just give out auto-fire as the default weapon. Constantly clicking the mouse button to fire each round is just horrible. Might as well call this "Carpal Tunnel Gunner". The laser is ok, but enemies don't line up well, so again with the massive click-fest. The spread-shot I can understand being single-shot, since it's powerful and multi-shot. The heavy bullet is just ... not worth it. It didn't seem to do much more damage, and still have to click each bullet.
The audio sfw & music (and voice) were great. But the the weaponry really killed this for me. I eventually gave up after a few minutes of playing. Don't plan on playing this again, either. It's too abusive for my taste.