If you stick to GDScript you have to actually *try* to make it not just work on all platforms :) You could probably do an HTML5 export and it would just work too! :D
Yes! I'm running the equivalent of doing that right now. If you want to send it to me first for testing I'd be happy to give it a spin as an extra test though!
Hey! I'm a developer of the Godot engine (I'm on the Project Leadership Committee) and since you're using a completely unmodified version of the engine (3.2.3-stable.official) and this is a 2D game doing a normal Linux/X11 export should just work. In fact this is how I'm playing it now! (A user can also manually replace the .exe with the Linux version locally without needing the sources to the game)
It still might be nice to offer on itch for people who bought it and don't know this is easily possible?
