Nice game! :D It worked on Linux for me, using Arch Linux btw and the Itch client.
I really liked the art style and the various things to do on the map, it was really charming and fun to play. Navigating the spikes in the underground parts took quite a lot of precision and I had to take a few tries to get it right :D My only criticism would be that the character felt a little bit floaty, and personally I would have turned up both the gravity and jump power to make it feel a bit more snappy.
Thanks for submitting!