oh no, that sounds weird
my first recommendation is; have you checked the controller menu to see if the controller is selected? it's in Settings > Controls > P1 Controller Bindings. it may be that the port the game is listening to for player 1 is set to the wrong port number. if you scroll through the list it should show a name if anything is connected into a slot. (Gamemaker's controller detection is weird? there are 11 total slots, and controllers seem to sometimes just assign to arbitrary slots
if it's not there, are you using an external bluetooth dongle for the controller or just built in bluetooth? i can try and see if i can figure out why it's not able to be detected.
Also, to your first question, i do the art programming and music for the game, and i work in gamemaker studio. ty for taking a look at the game