Gamepad on android seems not to be fully recognized

[garret]

I sideloaded the .apk on a FireTV stick 4K Max. The game starts and I can use the remote buttons to move around the menu. However, when selecting "Use gamepad" in the controls menu, it seems that my playstation4 controller (which works flawlessly with other applications like retroarch or ppsspp) is not fully recognized. Only the "X" button seems to work while all the other buttons (like moving and jumping) do not respond.

Do you know if it is a known issue and if it will ever be resolved?

Thank you anyway for your amazing work :)