You can use the same controls as in Deltarune, or use the bumpers or triggers (what I personally prefer). You can see a full list of all controls in the game description on this game page
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That would be cool, but completely impossible legally. Even if it were somehow ok legally, it would be way too much work, godot doesn't even have official xbox export support so I'd need to use a third-part option, which would likely cost a lot of money, which I can't afford to do for a free game lol