That was a really cool game!
I got frustrated at first when unable to beat Spike Lord but I made it to the other boss and it was really well made in my opinion (even if getting hit by the big ball can result in a kick death). I managed to beat Spike Lord with a bug : its timed attack continue to change when the game is paused, which makes it possible to just wait for the floor spikes to disappear.
The mechanics felt pretty good, but I would make the swing be able to shorten the rope to avoid getting stuck on the floor. I was kind of disappointed to not be rewarded for explorations (a few empty corners) but I understand that it takes time to do this sort of stuff.
Edit : I felt that coyote time did not work when falling off moving orbs, I might be wrong tho.
Edit 2 : Also really appreciate the Linux build.