The good is the story setup and the uniqueness among girls.
The bad is that when you do your daily tasks, you aren't presented with what skills each of your girls has while looking at the task. You have to backtrack to find out what each girl is good at.
There also seems to be a bad bottleneck in terms of even being able to survive. You don't get enough supplies without being able to scavenge. Eventually, they all just die.
There's also absolutely no difference in terms of results between the different levels of sex. If there's no difference, there's no point. At least give us more boost points as the level increases.
In terms of a demo, it's not very enticing as a result. There's got to be a cliffhanger point to get people to want to continue. As it is, all you've given is a grind.