That is really cool to go that far in the dev of a game !!!
My general thoughts goes to your texturing. I feel it is a little bit generic. I mean, sorry if I am wrong, you probably use the generic texture of substance painter and tweaked it. You could go a little bit far. I feel you need more AO subtility, more roughness subtility to give a better comprehension of the material.
I feel like you could work a bit on the modeling and texturing, right now it looks very generic. Like just some primitives stuck together and a random texture ontop. There are really great Tutorials out there on how to create assets like that. Artstation Learning is free btw. if you wanna take a look at that. But i like that you really go for a game
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But i like that you really go for a game