Thanks for the update! I am a Linux user.
Previous versions required a trick to get the game to start properly, which I have confirmed is fixed in this patch.
The D-pad can be used, but there seems to be a bug; the right side of the D-pad is recognized as down, the left side as up, and the up and down keys do not work. This bug may not occur in Windows. I have encountered this bug in other Unity-made games, so it might be a Unity bug. I don't know if this is something that can be fixed on the game side, but there are games out there where the D-pad works fine with Unity + Linux + Xbox controller.