idk about cheats but if you're struggling with bosses, hang in there. Once you figure out their pattern, you can beat em. the combat in this game is the best part so you're missing out if you just go for cheats
Unity, should even be at the start of the game I think. Definitely you can see it in the file structure, names and can try to unpack it in Unity Asset Manager or something. Used to mess with it years ago, only to find how badly some things were done in terms of potential modding.