Fun little game! I liked how it would jump for you in some parts of the level, but in other parts, it felt like I should have landed when I didn't. On the sideways platform, if I hit it at the right angle, it would bounce me away. Pressing spacebar more to jump higher was an interesting mechanic.
BTW, the Linux export only contained the .pck file, but I was able to run the Windows version using PlayOnLinux. Do you think you could add the .x86_64 file to the Linux download, or embed the .pck into the Linux executable?