The relationship between "active units", "seconds", and "inventory units" needs to be clarified. It is not clear.
The UI: It isn't clear how to say "fill up all the water I can".
Equally, the whole "You ran out of critical supply A" bit -- I have to get food, water, and air, and some of them are resupplyable once I get power going -- but, I have to get enough to work before I can even get power on -- and if I don't have enough, I can't stop the power fix to get more water/food in the middle. So how much do I need to stockpile before I fix power? Why can't I do some power work, eat/drink, do more?
I ran out of water while trying to hack the admin door. Because for some reason, I was too stupid to stop and get more water.