Wow, I really haven't noticed how much louder the choir is than the other instruments at that part. You're right about the drums, too.
I'm not really sure what you mean with the limiter and the beginning part. If you could be more specific, I'd be really thankful.
I wouldn't really consider Luigi's Mansion a "horror game" xD But that aside, I must say adding boo sounds is a great idea! Thank you.
Uhm... I didn't use compression at all. I'm not sure what I could have done to make it sound like "blatant overuse of compression", but I obviously did something. Again, I'd be really thankful if you could be more specific.
Thank you for your feedback, I really appreciate it.