The problem here is that in order to change a microwave to UV, you need to add energy to it. Generally, diffraction and distortion of light waves don’t change what part of the spectrum they’re on - that’s why water doesn’t change the color of light passing through it. The wavelength changes, but critically, the frequency doesn’t, and frequency is really what defines the energy of a given photon, which in turn defines the part of the spectrum it’s on. So if the microwave is turning into UV somehow, that means it has to be stealing energy from the container or food, which would make the food colder.
I’d expect the only UV rays that would be emitted within a properly functioning microwave would be from the appliance light bulb inside of it if it’s still an incandescent design or from the food/container itself if it gets sufficiently hot. I’m not sure of any mechanism in the magnetron that would make UV in any substantial amounts.
I think Satisfactory hits a few of these targets, if you haven’t already tried it. The amount of resources is determined by a map that is not procedurally generated, so there is a hard cap to your resources per minute, though the resources never run out. So end game focuses more on playing efficiently rather than brute expansion.