The buttons are mapped to different integer values. I mapped the xbox one, but i'd have to map different controllers and switch the values based on the controller identified. Your controller maybe works but with other buttons, instead of the Y for interact and A for select.
Nice!
I remembered to try again today and the same issues for me even after restart on Firefox, Brave, and Edge browsers. The button mappings are a bit odd as well; left analog stick moves around, but then L3 (click left analog stick) is mapped to move down and then the menu button is mapped to right trigger button.
Like I said, I am using an 8bitdo Ultimated Wired Controller. I don't normally have any mapping issues in other engines/games.