Note to mods: These are all junk sound files, and I'm not linking to anything illegal!
Out of total boredom, I was digging through this game's sound files. I love the final boss music, and wanted to see if the extracted version sounded any different than the ripped ones on Youtube.
It turns out that all of the boss songs in this game are .strm files, while all of the sound effects and world BGM are different files (.swar, .sseq, etc), so I guess that explains why they all sound like crap.
Anyway, there are about 100 or so .swar files in this game, and most of them are just weird boops and fart noises. But amongst that, there a few stranger ones:
These KIND of sound like the creepy music that plays in treasure rooms/Nester's house, but they're a bit darker and robotic. I'm not positive, but I don't think they're in the game. Then there's THIS thing: