Really liked the video! The great effects make the shooting really rewarding.
I'd really like to know more about the AI too.

I know you wrote that it's a testlevel, but you should make the ammunition for the more effective weapons much more scarce.
And since the gameplay seems to be based on weapon handling, you should try to get a lot more different weapons into the game, grenades, rocket launcher, time bombs, sniper (immediate hit), homing missiles, flamethrower..
maybe even (phewphew) lazer weapons?
Just a few ideas that came to my mind. Btw, cooperative multiplayer would fit this game well