I'd like to see a sequel honestly, the turtle was badass and could be the character of a franchise. Not many games mix that kind of character with these elements, but I think it could bring in a lot of cool mechanics to a stealth and horror-esque shooter since it doesn't need to worry about realism. The shotgun maybe could be in the game fully but have a nerf where you can't always use it or something, because the game changes quite a bit when you get it in a good way but then its also too easy to just blast them. The ideas in this though are superb in my opinion, I hope you make a continuation where you upgrade the mutant AI perhaps or a sequel. I liked the small details also, like the naruto running animation after I got the speed upgrade, this was a very cool touch.