One of the reasons it might be doing this is the startup dialog it could be giving the controller the wrong signal and causing it to stop working had to use GloSC to play your game although I do just recommend switching engines.
Hi, the reason why it does not work is because this version of the game is set to keyboard by default.
You have to press "O" to switch the input mode to controller and play with your xbox controller.
Yeah, it's not intuitive, that's because it is a developper key, this version of the game was intented to be played in our own stand at a convention, where the game was correctly configurated and where developpers were around the players to check if everything works fine.
Thank you for playing anyway :)