So, the ending music is the title music for I'm on observation duty 2, right? (I'm a big fan of Crawl and the I'm on observation duty) Are you sure you guys are allowed to be using that? Notovia probably wouldn't mind, but just in case you got it from some website, I'm almost positive Notovia made it himself. I just want to make sure you guys aren't accidentally using Notovia's song, and then you get in trouble for it. Good game btw, very spooky :)
We're glad you liked the game!
All sounds we used are listed in spreadsheet on the bottom of the itch.io page. The music you probably are referring to was uploaded on freesound with CC0 license - 2 years before "I am on observation duty 2" released. So I guess Notovia may also found it the same way we did.
https://freesound.org/people/Magmi.Soundtracks/sounds/417993