Thanks for the feedback! I was running out of time to complete the demo, so the joystick support is a work in progress. It worked fine with my joystick (a GameSir pad which has X-Box glyphs) but I did hear from other people it wasn't exactly working with other pads. I'll work on better joystick support for further revisions, and knowing which one you used is a huge help already.
Thank you for playing and hope you stick around when we manage to fix the support.