The version number you see here on itch.io is not the actual version number of the simulator. itch.io just shows you how many files I‘ve uploaded for a certain platform. I only recently began to include Linux builds at all. All of those builds have the same version.
That being said, I won‘t be fixing any Linux-specific bugs and the Linux build might be missing some features here and there. That‘s the only condition under which I‘m able to offer a Linux version at all. It‘s either this or no Linux version.