On the one hand, I'm grateful that I could buy Mark of the Ninja on GOG for my preferred platform (Linux) without DRM so many years ago. I also did buy the Special Edition upgrade, so now I got the remaster for free. And I just checked, and the original version (with its Linux installer) is still on my account waiting for me to install it and play it in the future.
But on the other hand, it's really frustrating to see the remaster with only a Windows version, especially when the Linux version is available in other stores.
You make it difficult to be a fan, Klei.
I hope the Linux version comes eventually. Until then, I'll be playing the original.