With the latest update 0.7.1, Roguebound Pirates is now fully compatible with Steam Deck.
The game features native controller support that was developed with Steam Deck as the primary testing platform. Based on my own testing, the game runs at stable 60 fps in most situations. I will keep making performance improvements and optimizations as the game progresses towards release.
If you run into any issues playing on the Deck, please send the details to [email protected] and I'll take a look!