You can right now actually! That's what I do, and here's how;
- Open the left wing menu, and click power, then switch to desktop
- Download game (LINUX VERSION) via any web browser
- Open Steam, and once you're in the library, click "Add a game", then "Non steam game"
- Select the "Predatory Persuit.x86_64" file where you downloaded it (likely into home/deck/Downloads), and hit add!
- Now, simply switch back to gaming mode and it should work just fine!
Note: If this doesn't work for your unit, try repeating these steps, but instead download the Windows version. Once you've added it, alt select the game in Steam to go to properties, then compatibility, and tick the box for "Force the use of a specific Steam Play compatibility tool". Proton experimental should light it up for ya when you try to boot it up now!
Hope this for now solution has you playing away in no time. All the same, thanks Crux for the game, and your work on Deck official builds/future releases. Love your work!