I enjoyed this one!
I found myself wishing that there was some kind of audio/visual feedback for going through checkpoints - I was sure at first whether skipping them mattered or not.
I would have enjoyed seeing some more elaborate level design, with optional high-risk shortcuts and time extension placements geared toward allowing a player to make up for a mistake, but I did still find the two levels included to be fun!
Hope you had a positive experience using Godot, and thanks for doing a Linux build! :D