I mostly use a Linux box to play games.
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Consoles are pretty weak compared to the PC when it comes to complex simulations, stuff like Heart of Iron 4. Maybe some of that is lack of a mouse, or maybe the TV screen covers a smaller portion of the visual arc than the computer screen. Maybe user demographic preferences differ. I think that it'd be reasonable to do controller-friendly ports.
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Android and deep games. A lot of mobile gaming seems to be incredibly-shallow. When I look at mobile, it seems like a great platform for turn-based games, low battery usage games. I don't have or want a Google account for privacy reasons. Android even with the inclusion of Google's store is weak, and cutting Google Play Services out makes it a really, really weak gaming platform. I have no problem paying for games on mobile, but I have a large problem with that being tied to being tracked wherever I go. I'd like a privacy-friendly option to purchase and a collection of good turn-based, replayable games on Android.
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I'd like to see a better port of Cataclysm: Dark Days Ahead to Android. This game is fundamentally tied to a keyboard interface, and someone did an admittedly-impressive job of making it actually playable with a touch interface, but it's still painful compared to using a keyboard. Needs a deeper UI overhaul.
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The one major game that I can't play on Steam/Linux due to Proton/WINE compatibility issues that I'd really like is Command: Modern Operations.
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I don't really want a modern port of AV-8B Harrier Assault on Linux -- the game is ancient -- but I'd like to see something in that rough genre, a military simulation with a dynamic campaign.