We are glad you enjoyed our game!
Xbox Controller (or similar) support is enabled already, although it has a minor bug with the Left Joystick (works fine with the D-Pad).
However, the browser cannot accept Xbox Controller input (or we couldn't figure out how to do that), so you have to get the Executable version instead.
As a side note: The fix for the mentioned bug is ready, but we can't publish it until voting ends.
Please give it a try make your Xbox Controller sweat with those perfect-timing combos :P