I played the game, was pretty spookers, albeit the character is quite slow and it hurts my soul. Also, you need to handle mental illness in a certain way when making content involving it. It isn't that you can't apply it, but the way you did doesn't work well. As mentioned in other comments, DID cannot be developed in adulthood, it isn't like dementia or a delusional disorder or something. I get that she doesn't have DID, there's a ghost or some demon or something involved, but you you didn't do your homework. That doctor has gotta be the worst doctor ever for thinking it's DID lol.
And don't get me wrong, I'm not saying you're shitty, I'm not saying you intended anything wrong (despite being wrong), but I am going to criticize you for a piece of the story that just comes off as lazy and is misinformed about an already heavily stigmatized disorder (the one "evil" alter, the violent alter, the manipulative alter, the alter that gives you super powers, etc, are all ridiculous please be wary of those tropes).
In the future, make sure to do research. And make your goddamn character faster! xD