After 2 months of Farlight84 being un-launchable on the Steam Deck, the Developers finally put out a fix addressing the Steam Deck issues directly.
As outlined in their update, there may also be an issue still with it launching in portrait mode, which they are looking into, however switching to borderless mode will fix that. This wasn't an issue in our testing as you can see below, this is now launching once again as expected
It's great to see Farlight84 working on the Steam Deck again, especially with over 32,000 active daily players (from SteamDB), it's a great game to dive into on deck