Looks pretty good, but there are a few things that detract from it:
- The target textures are really ugly.
- Cheesy waterfalls that every mapper seems to be obsessed with.
- The water is emitting a ton of light.
- Misaligned textures as I mentioned before.
- The spawn room shows through the sky in certain places. You'll probably need to use some hint brushes to fix this.
- Pipes should be phong shaded to make them look round.
- All the water surfaces cause problems for reflective water. It's better to just have 1 plane of water. If you must keep the waterfalls, use the waterfall texture without the warp so it won't cause it to be reflective.
Good job on the grass textures, though. Those look nice. I'd work on the steps outside a bit more. Make them a consistent size and align that texture in a way that makes more sense -- align the top of the texture with each step and with the top of the walls.
Also, when releasing beta maps, put them in the pball/maps/beta directory so they don't clutter up the regular maps directory.