I really liked the idea of the game! It was pretty fun to play, but there were some issues. The controls are a bit wonky at times and the fall speed is inconsistent. Other than that the game was well done, and I look forward to play more as you finish up the game.
https://www.youtube.com/watch?v=9CKH5fanubM
Hopefully this link helps. I've never worked with Godot before so I can't offer much else.
Check to see if the gravity is being changed for whatever reason. The problem is only when I walk off a platform and zip straight down (instead of the nice float down you get when you jump).
Best of luck!