Okay I think nice words dont help here. There is no nice way to say any of this but I will say it anyway
-The UI can be improved. Have it black and white like the cover and just vector graphics for it
-Dont use the standard unity lighting. Tint the sky a little bit and the light color as well.
-Use the unity landscape mode to build your landscape
- use a palette, the colors are all over the place
- The city is too small
-The mountain is not well conacted with the ground
-USE THE SCREEN SHAKE WHEN YOU KILL SOMEONE NOT WHEN WALKING (people can get sick (ill) from it very fast)
- Make your game page prettier, nice colors no black and put some info+credits+controls on it
I am sorry this comment is not nice it has only feedback to offer. I dont mean to insult you or the games you make and I dont put myself above you. Just have a thoughts about some of these points.