Hey,

Thanks for making me aware of the Mac/Linux issues (can't open the main menu, can't save).
I worked all 2 days to find the problems (as I do not own Mac/Linux). Thanks for Grimidk for the help with testing on macOS, and thanks for Jere for testing on the Linux. Also thanks for bami for helping me with the code on these systems.

I also added several other fixes, full changelog:

• Fixed the issue with the main menu/saving on Mac/Linux.
  
• Redesigned the spaceships landing code. It should work now at any time.
  
• You could turn Superheavy expendable and then launch a tanker with it.
  
• You could launch Spaceship to Mars without selecting the tanker.
  
• You couldn't click on Mars trackers with problems.
  
• You can now disable launch trackers.
  
• You can now disable game over.
  
• Fixed the issue with random time speedup.
  
• Fixed the issue by focusing on rockets on Mars.
  
• Added a text below the "Run" LinkLink button, which tells you where to build LinkLinks.
  
• Some additional optimizations and smaller fixes.
  

Remember, that you can ALWAYS report me any issues, and I will try to fix them as soon as possible (if critic) or with the next big update (if small bug).

Denis