Im sorry I cant give it more than 2,5/5 stars. Its a GTA2-like. Really liked the idea that you enter the building and it turns 1st person, that makes it different from GTA2. Maybe you could add something to interact while in the buildings. Like objects and/or puzzles to solve, or things to investigate. Maybe that could be the focus of what you do inside the buildings, a little detective work, or something, idk. The base for a good and unique game is there. You don't even have to "upgrade" graphics, silly and 8-bits works (but if you want it to bee more unique you could always do hand made sprites)
You should also add a functional map.

Anyway, good luck on your project