This is a cute platformer! I particularly like the cars that you jump on.
I got to the key but wasn't sure if there was something after that, maybe it needs a win screen?
The jumping is very floaty (over 2 secs air time); it might feel better if the air time was under a second.
It also might be nice to make some platforms one-way, so that you don't bump your head on them.
Overall great work, and thank you for the Linux build!