Oh that’s strange, because I could’ve sworn Light has been planned as an environmental variable/hazard for the Microbe Stage since the start of the project. Plus there’s actual scientific evidence of it as a hazard, which I covered in this thread:
Basically before the development of an ozone layer for your planet, the deep sea is the only place life can survive and evolve away from the deadly radiation of sunlight.
I was worried about that too, but I realized the other day that some of these variables don’t change much from patch to patch. For example, salinity will almost always be the same in all ocean patches (typical saltwater levels), and the same in all river/lake patches (freshwater levels). Then, the one exception to this would be rare patches like a salt sea / salt lake where it would be very high. pH / Acidity is another one that mostly won’t change except for rare examples.
I know very true, I know one of the aspects that added at least an hour to my latest Microbe Stage playthrough was trying to migrate from the Hydrothermal Vents to the Tidepool, and the challenge kept me hooked to keep playing every time I died trying.