It's the steam controller. I can probably configure it to emulate xbox controller for Godot games.
Godot devs might be interested to know that it doens't work out of the box.
EDIT: Seems like they know about it already. https://www.reddit.com/r/godot/comments/a28f1e/steam_controller_on_godot/
Good news. I got the steam controller working by adding your game to steam as a non-steam game, then playing it in big-picture mode.
Sadly, I'm terrible at these type of games, so I found it really difficult.
Normally I would want background music, but in this game I kinda liked the silence. It seemed to fit the mood.
