Sounds like a very very gloopy goobie silly boss fight. Meowsynth is nicely incorporated and I think you managed to use it with perfection, by using it differently enough that it feels rather alive!
I'd say sometime the metal pipe sfx doesn't blend well with the song and it become a bit too chaotic.
Other than that great song!
There was actually a LOT more of the metal pipe sfx before but I also thought that it was too much so I removed at least a third of the total ones there were.
for example, during the part with the more consistent short pipe sounds, there are little pauses between some of the short sfx, originally there were more full length pipe sfx there but I got rid of them.
