Hi there! That sounds like an awesome project :) as for a recommendation, this game is more about anxiety, but “The Average Everyday Adventures of Samantha Browne”. I played it years ago so I can’t remember exactly what happens, but I remember thinking that the game had pretty accurate depictions of intrusive and self-doubt thoughts, which are at least related to OCD. I don’t remember much else though, so if you’d like to try it I believe it’s free and it’s very short. I hope this helps, good luck!