Right out of the box DEMON'S TILT runs great on Steam Deck!
We're testing the game thoroughly on our Steam Deck dev kit. So far, so good! This looks like the ideal Steam Deck game.
Currently, we're researching ways to make Tate work best on it. We'll probably have a few button configurations for holding it on either end--so you can toggle that set of defaults on and off instead of having to re-bind keys every time you want to try this vertically. (Basically how we did it on Switch Lite)
If you have any ideas for features and enhancements you'd like to see in the Steam Deck update, let us know!