Supraland, a highly rated open-world puzzle adventure, has now removed mentions of Linux on Steam as the developer is unable to actually support it.
This comes shortly after the developer asked for Supraland to be completely removed from GOG, after being there less than a year citing lower sales. If you read that previous linked article, this news likely won't come as much of a surprise. Checking on SteamDB, it seems they removed the note of Linux support earlier in June. Looking around, the developer mentioned this in the official Discord, "I stopped direct linux support. Using the windows version with proton gives much better results like a much higher framerate.".
This quite likely means Supraland 2 that was funded on Kickstarter, which mentioned Linux as a planned supported platform, won't support Linux either if this is how the developer plans to go forwards.
We've seen how the developer has repeatedly mentioned before that they actually "know nothing about linux". A shame but if you're going to sell your game on a platform, that you don't test it on and don't support in any way, what's the point? It's not good for anyone.
A repeating problem too, the weird expectation that clicking to export in a game engine is enough to sell the game without testing or supporting it, which needs to stop. No one would do the same for Windows or Consoles but as usual, it comes down to the low market share cycle of doom. Developers don't support Linux directly with the lower market share, so less people use Linux and repeat. We're at least seeing a clear upwards trend right now, so perhaps one day we can see more direct support when the user share is big enough.