I already use Gamemaker on Linux using Lutris. Unfortunately the font is pretty blurry.
A native Linux version would be nice.
Could you make a step-by-step tutorial explaining all parts of Gamemaker, the current ones are really difficult to follow. For you as a developer the steps are of course easy to follow, but unfortunately not for others. I think that would make it easier for many people to work with it.
The runner would be a good start.