The second game from Geert Verhoeff that's only meant to be played on a Steam Deck is Game With Balls, a collection of handcrafted mazes to gyro through.
Read the full article here: https://www.gamingonlinux.com/2025/08/gyro-through-a-collection-of-handcrafted-mazes-in-the-steam-deck-exclusive-game-with-balls/