Don't worry, I'm still here! I've just been taking a personal sabbatical from game development to focus on life stuff. I'm happy to hear that the game is still capturing your enjoyment all this time later! Your feedback will definitely help me determine the direction of my future projects, whenever I get back to working on them.
I don't really document my development process, mainly just because I don't have the extra time for it. But, because this project was created for Ludum Dare, the source code is completely available for your viewing/downloading pleasure! Although, to be honest, just about any Godot platformer tutorial will help you make something of a similar scope - if not larger.