I wasn't able to open your blender file, but your UV's look good for the low-poly style that you went for. I think your models could have benefitted from some more in-depth texturing and high-poly baking but I like the idea you went for.

I like the idea you have going here with the playable demo, and it plays very well.  Going into the blend file, Topology and UVs look good as far as low poly goes. The colors and style work really well for this type of demo game. Overall, I quite liked what you did here. Good Job.