This is pretty great education for kids I think!
It is not super hard but in order to learn what to do you end up reading the help page a lot which is a nice game-y way to feed information into childrens brains! 👿
Once you figured out what to do it is very simple but it stimulates some thinking even as adult. I stopped after reaching a productivity of 300 because I was not sure if there is a "win" condition.
I also had problems on Linux. My integrated intel card was way too slow and on my dedicated nvidia card (nouveau driver) it had funny colors but was slightly faster to make it playable (sliding the help menu in took 5 seconds but manageable).