1. Video jumps around a bit too much.
2. Doublebarrel shotgun / triple barrel shotgun look good. Nailgun is sorta...eh. "Loogie" gun as well.
3. Maps and textures are good, but the enemies are definitely the weakest point right now.
4. Dunno about the sprite based trees, you might want to consider changing those at some point.
Overall, I'd say you're on the right track, but still have a ways to go.
(LordHavoc)