Loving it so far, with some work this would be a fantastic 1v1 and 2v2tdm map and I'm not saying that to be polite.
However there's a major problem, I think item placement needs work. There is a crazy loop you can use to completely dominate the map. Basically, with some practice to not get stuck and slowdown at the right places, if you laser-out of the rocketlaucher room you can very easily string pick up: rl, mega armor, electro, nex, crylink, mortar and small armor all in under 5 seconds, and come back to rl before it respawns. I'm not sure what to suggest, but maybe moving one of those weapons to either the megahealth room (maybe on the ledge where there's 2 rocket boxes?) or the room with lava and ammo would help. There would be a bit more distance between them and make it impossible (or at least much harder) to pick up all weapons and come back to start point to pick them up as the respawn again.
Visually I love the map, nothing to say there.
EDIT: I think rl and nex are fine where they are, but for other weapons maybe moving one to lava/ammo room (that room could use an important item, but I like that there's no hp/armor there) and another in MH room would spread out weapons quite nicely. I would move mortar for sure.