So... uhh what do the choices entail?

[Gon]

This is what I think about "making decisions" in SOMA:
I think that FG didn't want to make different endings based on your choices because it would make people make decisions based on ending they want to have. You know, people would "do this and not that" just to get specific ending, not because it's their choice. FG wanted to make people think about their decisions, to make decisions based only on own feelings and to test yourself, not because "this is needed to get good ending" or anything. SOMA is very specific game and people are aware of it. It's not for everyone.