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I was playing around with Pico-8 on my steam deck and tried this out. Not only was it pretty dang good in general, but I noticed the "developer mouse" option, and, low and behold, next thing I know, I'm playing this with proper two-stick controls. *mind blown* Very cool thing that I never expected to be able to do in a p8 game. Cheers.

is there a way to get pico8 working in gaming mode without proton experimental.

There's a native Linux version of Pico-8 so no need to use Proton at all.