(https://www.ugx-mods.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FU4it2AE.jpg&hash=3699465edc0559b4cb69f4a717f4ae7649334d72)
Don't use blend textures unless you are alpha blending or are using decals.
(https://www.ugx-mods.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fg40T0ED.jpg&hash=3fdec109a5409d114e1d37efa10ca9385e21b6a9)
Make something like this fence detail so it doesn't look like there is a hole in the wall.
(https://www.ugx-mods.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2F3Oj1xFh.jpg&hash=3b83d33d37fdd0e0692c390663c6b43459eefd04)
Heres an example of where alpha blending would be good as its strange how the road just ends.
(https://www.ugx-mods.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FI2vqyzf.jpg&hash=185ce1dd2b20f360316fa74b749a034374fe3f9d)
Another alpha blending example
(https://www.ugx-mods.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2F99w4got.jpg&hash=95b1d8d1b75acde6bd995d078294d239460bbe39)
It's nice that you are adding this kind of detail but you should mix it up a little. They are in constant rows and would look a little better if you changed the positions randomly around a little bit.
(https://www.ugx-mods.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FfB9BsCK.jpg&hash=2f657eefd2ccc2fc36ea85b67557e63971d23444)
This isn't an issue, just more of a suggestion. It would be cool if there was a way to get down from here. You can get trapped pretty easily and it would be nice to be able to jump off, but that's up to you. :P
(https://www.ugx-mods.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2F55BmElu.jpg&hash=ce6ea22bb16cce19cd5ab888d9b84b56552197a8)
These tank tracks are animated so its a little weird having this model stationary.
(https://www.ugx-mods.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FJq1jCNz.jpg&hash=5d6b8df729939a6eb15c675850c9de14539076d1)
This roof just isn't that realistic IMO. I would recommend following blackjackjonnyy's roof making tutorial as it helps get more realistic looking roofs.
CoD Radiant : detail made easy : Detailed roof using patches (http://www.youtube.com/watch?v=Z8HGAt9jaLI#ws)
(https://www.ugx-mods.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2F763hwmT.jpg&hash=e900ec1152dfe20f4bba21b9ca87b3076befb88d)
If you are going to do something like this I would recommend cutting the brush with the clipper tool in the middle.
Then just some other general concerns:
-buyable ending is too expensive
-buyable ending trigger is not noticeable enough
-pack a punch should be moved back into that back room more