Wow I loved the idea! But I got stuck on level 7_hex. I am not fast enough typing open/close. A tab completer would have been great.
Also I may have found a bug. On level 7, I could let one of the cores die (the one on the bottom left) and focus on saving the other. It would then say I had passed the level but there would be no new computer to connect to. I'm guessing the string variable was empty.
Good job!