My initial thoughts after running through the map a bit is that the layout is unnecessarily big and confusing. There are too many pathways. Look at Mirage - It has 3 entrances. Two the T's control, and one requires taking mid control. Meanwhile B only has 2 entrances: Palace and Cat, one of which requires taking mid control. There are a few other ways to split around, but those are very risky (such as dropping into Window as a T to flank). So you have waaaaay too many entrances and pathways. I recommend making the map smaller, with less pathways.

Also, lighting is a huge problem. There are quite a few areas where the lighting favors people who want to hide and flank. Also, the mini map fades if you get too low into the ground. For lighting I suggest you try to look at some Hammer lighting tutorials to get some ideas, and also maybe look at de_nuke in Hammer and look at what the CSGO devs did with lighting there, because you could probably mimic how they did it to get great lighting for your map.