At first, it was pretty tough to figure out the controls, but once I wrapped my head around everything, it became really fun. There are many elements you have to keep an eye on to keep the reactor stable. I made it to level 5 or 6, if I’m not mistaken. Then a rock got stuck on a vent and I couldn’t get it out, so a meltdown happened.
This definitely deserves a polished version. I enjoyed your game.