The game does work on Steam Deck!

If you do have the itch.io app set up on your Deck (which is a whole separate process which I won't cover here) then you should be able to just install the Linux version of the game.

If you don't want to go through the itch.io app, it's a little bit more work, but it's still doable! Follow these steps instead:

• Switch to Desktop on your Deck
  • Press the Steam button
  • Go to "Power" in the menu
  • Choose "Switch to Desktop"
• Open up a browser and navigate to this game's page (https://speveril.itch.io/evil-island) and download the Linux version
• Unzip the downloaded file somewhere on your Deck's local drive
• Go to the directory where you unzipped the game
• Right-click the `Escape From Evil Island` file (it has no extension) and choose "Add to Steam" from the pop up menu
• Use "Return to Gaming Mode" on the desktop to return to Steam
• In Steam, go to your library, and navigate over to the "NON-STEAM" tab
• You should see Evil Island in the list!

You should now be able to launch the game as normal from the NON-STEAM tab in the future.