So I took a look at your map. Here's what I've got.
When I walked out of spawn I saw... Maze. That's the only word to describe this area. Maybe try to rebuild it to be less... Mazing.
I walked into this expecting that it will open. Nothing happend and that's weird because:
There's a sightline(?) behind this door!
At the end of this area you have this bug. May be nodraw or bugged area portal (or idk).
And I guess this big metal thing is supposed to be a door from that sightline. Does not work neither.
Whole map is overscaled (next time you make map, check these links I and
@Da Spud Lord gave you), but this ramp is HUGE.
What's this area? Looks like it was (or wass supposed to be) a sightline. It's not visible from gameplay space, so I don't think this sould exist at all.
I guess these big black blocks are supposed to be these sniper blockers, but they just are frustrating looking bad. Maybe try to replace them with fence props? Idk.
Also there's a lack of health and ammo packs (3 on each side).
Maybe this will help you in the future (or maybe not).