Hi,
I have a "Linx Vision 8 inch Tablet with Xbox Controller":
https://www.amazon.co.uk/gp/product/B0187U2M1OI'm running Slime Rancher from Steam on 32-bit Windows 10 (fully updated, as far as I'm aware).
The integrated controller does not seem to be recognised by the game. Nothing at all happens when I try to use any of the controls, either from the initial menu or from within the game itself.
The controller identifies itself in Joy.cpl as:
Controller (Vision Controller System(Console Mode)).
It works just fine in other games (Stardew Valley, Crimzon Clover, Chaos Reborn (another Unity game)).
If I connect a wired XBOX One controller to the tablet, that works fine too.
(The game runs fine on my various other devices with wireless 360 and One controllers).