A really neat almost rogue-like with a nice way of keeping it fresh with the changing weapons. I think it could've benefited from more weapons, I got the choice of duplicate weapons a fair few times in the chests.
For polish it might be worth looking more into the weapons, seeing how their DPS balances out. The sniper felt very weak for me, though its always notoriously hard to make a sniper feel as balanced as an M4.