I'm not a big horror person, hell anything remotely close to horror scares me haha but I did my best to pull through. For some reason I couldn't get past the final boss even after pushing the health down to 0 (but reading the comments, I see there's a flying Koopa I also needed to beat).
It's clear how much effort went into this, and your passion is telling; keep going! (just...don't do horror games for my poor heart. i kid, I kid)
Also, concerning the flying Koopa, I think it's because it's own Health bar was not clear to see, maybe that's why some of us didn't know it needed to be attacked too.