The night parts are bullshit! You just die with no warning or any ways to prevent it. Somebody just create a 100% walkthrough or something.(preferably without commentary) ;)
just give a gift to every girl in the final night. It seemed pretty obvious to me, and generally I'm pretty dumb with puzzles.
There are warnings here. I hear animal cries if a girl is unhappy, and an angry icon appears near her house.
Call me stupid but I feel like, at some point, you don't have enough time to get the resources needed to gift every girl within time.