Games not working with USB controller (OTG)

I just recently got a new Galaxy a71 and have wanted to play some games on it, but the controller just isn't working.

The games I have tried it with are: Don't Starve pocket edition, Stardew Valley, and Dead by Daylight mobile. (None of these would do anything with the controller)

However, I did try the controller with a program called Parsec connected to my computer, and it worked perfectly.

Help is much appreciated!