Great work! The movement feels good and well thought out but sometimes frustrating when I wasn't launched the way I expected because of pressing space or shift too early but I got better as I played. I would suggest adding some form of checkpoints in the sub levels or if you want to keep it this way maybe an easy mode with added checkpoints?
Also for some reason on my first playthrough I decided to run past the first level and into the cave at the end of the path, which did not let me return after I realized I could not make the jump, so I had to reload.
Once I had finished the first sub level I was happy to find my first shortcut. Still it felt really difficult to do all the needed jumps each run, but I can appreciate a challenging game. I felt like the levels could be a bit more forgiving, especially if you plan on making more these feel tough for level 1 (but I don't play a lot of platformer games so I may be wrong).
I wish I was able to play enough to finish the game but I died waaay too many times (major skill issue) and ended with a sore pinky lol.
Random note; The skateboard and halfpipe in the first level would be a great minigame or easter egg opportunity if you could ride the board or something!