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. A demo is available for the game right now to get a taste of it.
Check out their teaser below:

Direct Link
More about it:
Game With Balls! A little collection of handcrafted mazes for the Steam Deck, where you use gyro movement to navigate one of the balls through them. Are you the one with the best time among your friends—or even in the world?!
Over 40 levels handcrafted in the real world using real wood, drawings, and other materials, then converted for your digital pleasure.
An additional 10 challenges that not only test you on the time it takes to complete each level but also on other objectives.
Keeps track of your fastest times using Steam Leaderboards, so you can see if you’re the quickest among your friends—or the fastest in the world!
Collect all secrets in every level to not only be the fastest but also the ultimate completist.
Original soundtrack to relax to (or maybe not when you’re trying to beat your friends’ times).
Interesting to see, although probably only a small market for such a thing. Previously they released Better With A Friend, collection of hand drawn mini-games for the Steam Deck which only has 10 user reviews on Steam.

As always: support for the game is the most important thing, not what specific platform the executable was compiled for.
despite what the title itself, and what the developer said: it actually relies on "ISteamInput" to handle Motion Sensors. it actually works on all Controllers that can support Motion Sensors, including Steam Deck and the likes.
for some reason: Geert Verhoeff doesn't use the Opt-in System to forcefully use Steam Input for all controllers.

I don't see a problem with it using Proton. The same reason as always: a single build for the developer to test. And yes, that also applies if Steam Deck is the only target.Doesn't change the fact it's pretty goofy imo. It's like making a Switch exclusive by developing a game for Android and relying on translation layers, sounds like you're only overcomplicating the process and adding another layer of failure.
Last edited by ScottCarammell on 5 Aug 2025 at 5:40 am UTC
Coming to the second thing that was pointed out: Why use proton? On the one hand I want to maybe support other handheld gaming devices later that run Windows. On the other hand: why not use the power of proton anyway? I am a Windows developer by trade and as long as the game works as intended I personally don't see an issue using it especially for the Steam Deck (if I would make it for instance Linux desktop I would reconsider that).
Thank you all for the kind words and interest!