Thanks for the heads up Tiagao! Tested and works with Moto Gamepad. Have to go into Options and Controller settings using touch screen first, then select Joypad Options. From there you can manually configure the buttons by selecting them with the touch screen, then pressing the corresponding button on the gamepad.
Glad to see the dev was able to get his work out to mobile, especially after the Nintendo shutdown. I wish other PC devs would follow suit, like the devs behind the DBZ Fighting game, or the Sonic before and after sequel games. But I understand the IP Forces would frown upon it.