Thanks for your question, glad you enjoyed it too :)
And yes there is! :)
The best way to do this is either through Steam Remote Play; or something similar such as Parsec. Any sort of remote play app will work though.
That way, you can either use your mouse or the gamepad cursor to press the buttons that are on the screen to control your partners gamepad.
Hope this helped :)
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Thanks! I can't try it rn because of work and such but hopefully I can do it with my partner soon! Though uh, they'd probably be using it on me, which I think means they'd need to get a copy as well (but this isn't too expensive which is nice so worst case I'll just buy it for them or stick with the demo). Either way I'm sure we can figure out a way for it to work, so thanks for the response!
So the way you can control your partners gamepad is by clicking the onscreen controls with your mouse; that will control your partners gamepad . With the demo, the onscreen controls are locked so you will need the full version. If Parsec is not working for you either after this, you can always try Steam Remote Play too. Buying from Itch will also give you a Steam key so you can use either one.