Steam has awarded our game a Playable badge regarding Steam Deck compatibility. That’s not bad, considering we never specifically developed for this console.
I think what separates us from a Verified rating are the small fonts in some game elements (cell phone texts, the end of the Credits) and something they call Controller Glyphs (likely the mouse cursor).
In any case, we can confirm - and it's supported by feedback from some players - that Whispers of Prague is fully playable on Steam Deck.
Enjoy!