wow. This is a really cool game. I like your usage of delta timing, and the sound fx variation on slow mode. Using channel pitch I presume? Neat explosion particles too. They don't just fall through the ground, instead they bounce. The weapons are also very nice. Although I noticed one interesting bug/misc. feature. It is that in slow mode, with the plasma shotgun, it fires as many times as you click, allowing you to release 'death volleys' at your enemies.
This would be great in multiplayer.
This would be great in multiplayer.