Great work on your first Godot game, and very nice concept! It's pretty well done, and I liked the art style, sound effects and writing :) Good idea to put an instruction screen with gameplay indications while setting up the stage for the player.
I got fired a few times but finally managed to get through the day, take that Mom :P
BTW, the jam requirement for providing source code is to provide the actual project files with the scenes, assets, etc., so that it can be edited directly in Godot and learned from/modified. As is, the sources you uploaded are just some text files of your GDScript code, so it doesn't really fit the requirement.