My game is overheating my PC (Not laptop) and when I'm tries to save progress, it's literally shutdowns my PC due to overheating.
Ventilators can't handle the game's overheat.
if turning down settings doesn't help there is unfortunately not much you can do, the game is still very unoptimized being a pre-alpha with one actual engine dev stretched very thin already.
You may need to replace your PSU.