First of all, you collect elements to effect your stats. You can get as much as a 20% increase (I wonder if it should be higher) in attack speed, attack power, and defense, and a 30% increase in maximum HP. If you neglect your elements by not killing enemies or picking up the items, you can drop as low as 25% below.
Also, there's a whole new weapons set, which I'm pretty proud of. There's 9 weapons, including a flak cannon, air gun (not what you think), flame thrower, etc.
They can all be can be picked up like normal, and aren't simply randomly placed. There was a problem since there's only 6 weapon items placed in maps, and I needed 8, but I came up with a nice solution to spread it around. Since it's not random, every time you visit the same map, you'll encounter the same weapons. So the gameplay of a map isn't dependent on randomness.
There's also custom map rotation, so you can set up a maplist to randomly select what map to play next, or play custom maps in any particular order.
And, of course, there's frikbots to play against if you don't have human opponents.
(btw, the multiplayer bug is fixed if you use tomazquake's newest version, despite what the readme says).
I can post some screenshots, but that doesn't quite do the mod as much justice as actually playing it. I'm hoping you'll like the weapons if nothing else.
http://forums.inside3d.com/showflat.pl?Board=Inside3D&Number=15984&page=0&view=collapsed&sb=5
BTW, I've been told by one person that the alt fire wasn't working for him. Hopefully y'all won't have that problem.