This is a fun game! The graphics are really nice too, and I love the quirky presentation. I got up to the arrow in the gray cave area, but wasn't skilled enough to get past it (I also got stuck in the ground next to the stump at one point, unable to move, and had to restart). I would have liked to have more control on small jumps, and perhaps clearer indication of what can be landed on, but the jetpack mechanic is very fun and the Foddian aspect is challenging (and funny) without being brutal. Great work!
PS: Thank you for the Linux build :)