I just wanted to throw my 2-cents into this discussion...
Although I enjoy the idea of making this a more survival-esk game, I feel that it can easily be done without resorting to things like hunting and food. For example, resource management that makes more sense in this universe might be things like energy, oxygen, fuel, temperature, etc. Your suit/base handles your basic human needs as long as it is powered. So long as you can breath you can survive, and as long as you have fuel you can travel/generate additional power. This is just an example.
Also, I highly disagree with railroading the first portion of the game behind something along the line of the tutorial. Unless it is skipable or has a non-trivial purpose, if you assume you game for a few hours a day and it takes you an hour or so to complete the tutorial you are basically paying money to do a tutorial.