Hello! Thank you for your interest!!
For fullscreen, you can press F11! As far as I know, it shouldn’t break much, if anything, so give it a try.
As for controller, I didn’t really consider the possibility when I made the prototype. A lot of the keybinds are listed in the Itch page’s description, though they do not match the inputmap names.
If I continue work on this separately from school, I’ll definitely consider adding support for controllers! I’ve heard managing cameras can be a little difficult with a joystick though, so I’ll see what modifications I have to make to the current system.