Got inspired to do some hands-on feedback with this. Feedback will be below images.
This rooms feels very large and empty for an opening spawnroom. I think you could shorten up the length, as well as the height a little bit, to make it feel more realistic. Take a look at what Gold Rush does with its first BLU spawn. Also, I don't think the shutter in necessary given the layout of your spawn.
BLU spawn in general feels very aggressively large for how little space you have to play & move around in. The outdoor appearance of the base is good, but the interior has nothing inside it at all to make it, well, full. Shortening the height of the indoors area would help make the base appear more "full," as there'd be less space overall to be "used." The spot with an arrow and question mark are to ask about a possible slanted roof being used? Unsure about it though.
Jumping into these windows is very annoying and could be fixed by having some clipping there. Also, I don't feel that the divider here is needed. It just makes the space more cramped, and it makes getting into the windows themselves even harder.
Slim this up a bit; As-is, the space feels a bit claustrophobic. Maybe add a window in the wall above the line to make the area feel more alive?
Moving the RED point here would give defenders a bit more of a chance to have a good setup at A.
Make it more obvious that you shouldn't be able to stand here. Having a big, solid, prominent feature would convey that well.
Move this ramp forward to around here. Rn it feels *really* far back and it looks janky in relationship to the walls. Also, make it a staircase.
Forgive me for my wording but this is really fucking thin. Widen it up to that 10% texture line on the left, it would make it so much more bearable.
Add a transitional space right here. Right now, there are VERY few routes to get into this buildings, which makes it a super hard choke.
Not entirely sure how to fix this but this room in general is really janky and needs a revamp soon.
Weird choice in-universe to have this area of the building to be entirely blocked off by "storage." Put a door on the flat wall and open the area up a bit if you keep that high ground inside the building.
This underpass is cool but why is there a full ammo kit there? You could just make it a medium.
Single spawn exit makes me cringe very hard but I'd need to play the map for an hour or so to get a real feel for how it plays here.
(running out of steam btw, feedback may be more blunt or simplistic)
Either move house forward or move rock & fence backward, this is another example of having good "Hey you can't move here" boundaries. Big things tell players that better than small things, ex: fences.
This is funny but also not fun to be punished for trying to play the map. I should be allowed to rocket jump here with my own skill and use the height to my advantage.
This is cool but what am I pushing the cart here for? What am I blowing up?
Also, NEVER balance with Full Health Kits. Just... no. Make that a medium or something.
That's all I have for right now. Give this map some more love.