A clearer indication of how critical the vitals are, or rather, when do the levels become actually life threatening would be nice as currently it's not really clear. Several times I had all 3 lines in both hunger and thirst being deep red for quite some time and still didn't die as apparently there's still some margin after that, but it's not clear how big is it and how can you tell how much time you have left.
What also seems confusing/inconsistent is the "Organ Integrity" line in the Exposure section as it doesn't seem to be linked to anything and feels to be just changing randomly.
What would make sense (to me, at any rate) is that first the hunger/thirst/exhaustion stats start dropping line by line, slightly influencing the organ integrity stat. Then, once say 2 of the 3 categories have reached the "all 3 lines red" state, organ integrity would also start dropping rapidly, and when that reaches red, you WILL die. If during this final stage you can get the number of red lines from 6 (3 x 2 categories) to 5 or less (even if just slighty above, to orange) by eating/drinking/sleeping, organ integrity stops dropping, and if you have more green lines than red, organ integrity slowly starts gettng back towards green too, up to the "average" condition of the rest of the stats.
Radiation exposure and low core temperature, on the other hand, would directly lower organ integrity (below what the other vitals set it to), so that you can die of hypothermia or a fatal dose of radiation even when your other vitals are in the green.
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