I will admit, I am quite surprised. Supraland from Supra Games recently released on GOG and it was only for Windows. The developer said some odd things about it all and now it seems they changed their mind, thankfully.
Today, the Linux version of Supraland officially went live on GOG and GOG themselves sent over a copy for me to check out. I've already played through the demo on Steam and apart from some performance issues here and there, it's a delightful game.
If you've not played it, the whole game is incredibly colourful with an sort-of open-world 3D setting in a literal sandbox. You're basically running around something designed by a child, complete with blocks that look like Lego. It's stylish, the puzzles and exploration are great and I love finding secrets.
No issues with the GOG version, runs as expected. Nice to be able to continue progress from the demo too!
As a reminder Supra Games are also currently crowdfunding for Supraland 2 on Kickstarter, which is confirmed to be coming to Linux as well.