Looks cool, regen works good as well as the buttons and teleports. Only some little things:
-Level 5 could use a bit more lightning since the glass at the end is barely visible, i suggest placing lights on the top corner above the Black platform.
-The water at level 11 is invisible, idk if you've done it on purpose though
-Level 12 has a little exploit in which the player can jump to the door (When closed) and stand in the wall below it. You could put a trigger_teleport there because it can also result in a complete skip of the level (A player keeping the door open).
-The last part of the wall course seems to be missing a door to go back to the previous levels (Again, i don't know if you meant to do that).
-You could raise the ceiling a bit on Level 15 (Last one of wall course) So that the player doesn't bump its head, and also stretch it a bit more so the strafing and then shooting parts are a bit easier (It's not that the level is too hard, but that could help a bit more for new players to aim better at the button).
And something not bad but maybe useful to you:
You could apply the same texture to the "Nogrenade" walls so that instead of using multiple textures for it you could use only 1 and use the other ones for different stuff (i.e. if x texture represents sync, z represents pogo, etc). Of course you can ommit this since it's your map and you can do whatever.