Four-ish people, actually! Myself and Ramble wrote the game script in various pieces as inspiration came, and later I edited it all together as Ramble built it into engine (That cool headbob animation is all in engine- the guy's some kind of wizard), but as we did that, NastySwirls was our phenomenally impressive artist who was creating the beautifully designed characters, background art, and each of the CGs! Their creativity and visualization of that unique biology was a huge part of what made this game all come together.
Wachi was also a friend of Ramble's who did most of the music; I'm not sure how much of it was made specifically for us because they never officially joined the team channel, but they're pretty prolific in my opinion, too!
It's just neither of them have itch.io accounts, so they're all credited on the main game page instead.