Hey I had checked the v3 version so Idk if these things have been fixed in the new version, but here are a few things I found:
You have these very dark spots. You probably need to adjust the shadows using the shadow_control entity.
This is a little boost spot you can get into, maybe just block that off.
You can rb to this spot, seems quite op for me, probably best to just block off that roof.
With 3 people you could pull off this boost and have someone stand atop of the church tower. You should probably just make the roof of the tower inaccessible.
Other than that I really like the look of this map and would love to give it a try.
Good work!