Few things I'd recommend for future reference:
The player sprite jitters a bit when moving, this is an easy fix by setting the process callback of your player character's camera to physics instead of idle.
The player movement felt a bit stiff, some coyotetime and a jump buffer would help some, but mostly, being able to short jump by quickly pressing jump would make some of the platforming feel cleaner.
Overall though, nice work on your first game, congrats!