Quite well done overall Time of Eve may have suffered from the short episode lengths. Most are only 15 minutes long, the finale is roughly half an hour, and this may have forced tighter editing than was wise. As such Time of Eve simply doesn’t have the room to thoroughly tackle the issues raised in the premise.
Certainly much of the back story is only hinted at.
I’m glad I saw Time of Eve as there is a lot to be said for it. I didn’t get the full emotional effect, but I do appreciate seeing intelligent anime tackling serious topics. I recommend seeing it at least once.
 Original Net Animation, it’s a new term for me too.