Retro handhelds winlator

So, I don't know if this is the place for this, but I have a Retroid Flip 2.

Love it.

Here's my issue. I downloaded the windows version of Stardew Valley, and want to run it on Winlator. It takes a bit of a long time to boot up....but it does boot. However, it does NOT seem to recognize my controller thats built into the system.

Mouse seems to work just fine. I assume keyboard does as well. But that doesn't help me. I need the controller to work.

Any advice?