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The game page say "Controller recommended", but what is really supported? gamepad only? arcade stick? xinput? direct input? Are controls rebindable?
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Arcade stick - https://steamcommunity.com/app/283680/discussions/0/522730701893060172/

Keyboard controls let you bind actions to QWER/ASDF/ZXCV, and movement is arrow keys only.

Not sure about direct input, most probably only xinput.
seems good
It is mostly optimized for keyboard.