This looks really cool. A physics based FPS platformer with lots of momentum. There's probably a super high skill-cap here. Fun to move around in once you get used to being so slippery. If you've got a railgun you can basically fly.
I had some trouble finding the targets in single-player and it took me a while to figure out that I was supposed to be destroying them. To me they look like mines and I thought they might be a weapon at first.
I'll have to get a group together to try it with sometime. Well done!