Anyone have any idea where these are stored at for Steam? I've been looking and googling for like 20 minutes but haven't found anything promising. Was hoping to delete the save to start fresh for 100% runs.

Ok, so may have found a solution. May not be the best solution, but it's working so far so I'll take it. But the process involves deleting both a level & a settings file in both the registry as well as where the steam cloud stores saves (I think?). If you delete the level/settings files in either but not both, it won't work. But somehow deleting both files in both locations seems to give you a fresh game file the next time you open it.