So, it's a pretty good game, but a few points of feedback:
One, when I beat the final boss and try to teleport out, it goes to fullscreen and restarts the game. Which sucks.
Two, the arenas need to be a little less claustrophobic- the enemies come too fast, and its way too possible to get cornered and die in a non-interactive fashion.
On that note, mercy invulnerability when you respawn- it's absolutely possible to get caught, die, respawn and kill a barrel guy, die to the explosion, etc. Alternatively, I've died to the boss, then immediately died on respawn because that's where the boss is located, which sucks.
The railgun is a terrible gun- it doesn't kill the barrel guys on one hit, and due to the rate of fire they actually get more time to run to you compared to your normal gun. it's also too small of a line of travel- if your enemies aren't in a perfect line from you the gun is awful and will get you killed.
It would also be cool if there was something to do with your winnings other than buy lives. As-is, there's no reason not to just dump your money into extra lives.
Upsides, the game is pretty, and enjoyable! I look forward to the final version. But as is, the game-breaking glitch and occasional non-interactive deaths suck.