When first launched, the game completely froze my computer, and I had to do a physical reboot.

With nothing else running on the computer, every time this game launches the computer makes a constant loud buzzing sound, and according to CPUID HWMonitor, everything Doubles in heat.

I used CAN YOU RUN IT website to see if the problem is with my system, and no it is not:

Video Card
Minimum: GeForce GTX 960 or AMD equivalent, 4 GB VRAM

You have: GeForce GTX 1660

CPU
Minimum: Intel(R) Core(TM) i5-4460 or AMD equivalent

You have: Intel(R) Core(TM) i5-9400F CPU @ 2.90GHz

RAM
Minimum: 8 GB
You have: 8.0 GB

OS
Minimum: Windows 10 x64
You have: Windows 10

Free Disk Space
Minimum: 30 GB
You have: 767 GB

Most Unity games stop overheating the GPU when you limit FPS in the settings to 60 or 30 Frames. Maybe Iron Harvest it's not a Unity game, but it might help anyway.

Also take a look at this thread on Steam , maybe you'll find the answer how to deal with your problem there:
https://steamcommunity.com/app/826630/discussions/0/2943622078752924683/