Sadly you're right. The game engine does support android at least but that means months of coding and testing to make sure touch commands works on it. And also recreating the entire UI to work on a tablet or phone screen. Right now the menus would be too small even if I make touch compatible.
Unless my patrons decide to ask for a android release I won't focus on that since I release updates monthly for them.
And about iOS I doubt it would happen even if I make the game compatible with Android since Godot so far does not support iOS. Sorry.