Download GDRE Tools which allows you to decompile the game to get the file (a folder), then open the folder using Godot to mod the game. (I use version 4.4.1 of Godot.)
https://github.com/GDRETools/gdsdecomp
https://godotengine.org/download/archive/4.4.1-stable/
(Sorry for the late response, very busy with school and stuff)