Pretty cool; I like the idea and the controls are quite smooth.
Some complaints/suggestions:
1. You're archiving and shipping your entire project folder. In fact, only the .exe file is needed to run your project (as long as the .pck is integrated into it), so you should only put that in the archive (and probably a license file for Godot: https://godotengine.org/license/)
2. Didn't find a way to enable fullscreen. Since the game is pixel-art, maximizing the window results in a non-integer scaling ratio, because window decorations take up space, too. In other words, your pixels become blurry because of no fullscreen. More generally, an options menu would make the user experience much better.
3. The idea for high jumps when running is interesting, but there is unfortunately almost no reason to not just hold shift for the entire duration of the game, which makes the mechanic irrelevant. In addition, you can start and stop sprinting while mid-air, which, in my opinion, doesn't feel natural.
Overall, good job!