I can't get the inputs working (arrows or wasd) even after click. I looked at the debug output and found the note below, not sure if it helps you.
The art is pretty though, and the theme music is really cool.
buddy_up_winter_2022_big.js:9 getGamepad will now require a Permission Policy. Please update your application accordingly. For more information see https://github.com/w3c/gamepad/pull/112