The version here in itch has been behind Steam for a couple of months now, sorry about that. Here’s the collected patch notes for patch version 1.04a, 1.04b, and 1.04c:

• Somewhere in uploading a new build, asset changes described in the patch notes for v1.04 had ended up not being packaged in. Now rectified
• Performance on some Linux setups should no longer be uncharacteristically awful. I had accidentally been polling every evdev device every frame when a controller wasn’t plugged in which could cause the game to perform disgustingly bad
• Binding jump to the scroll-wheel could send you soaring way higher than intended. This has now been patched up so jumping no longer causes a feedback loop with coyote time.