Exactly what I did too. At first, the game had no sound. I returned to desktop mode, launched it (had sound here), closed it, and returned to gaming mode. Sound was fixed. After this, the game played just fine on Deck.
Looking forward to playing. I’m trying to sideload it to Steam Deck (suck it valve). Steam has FUTA FUX FEMBOYS but won’t sell Horses? Go figure! Humble also removed the game after I received an email alert from them for it. Even if I am unable to play it, happy to support.