Max's life
I avoided it for a long time because the description makes it seem extremely amateur, but at this point it has like 4 years of development in it. It's split into 4 parts with massive content in each.
Episode 1 was "remastered" so you don't have to sit through all the weird development choices that creator choose initially. Episode 1 is IMO one of the best sandboxes I've played. Episode 2 isn't remastered yet and has some odd quirks because of it. I unfortunately couldn't play through it because it's so huge Renpy lagged like crazy, it really should have been split into two itself. Episode 3 is great although somewhat bloated. By the end of episode 3 you have like 15 rooms in your house all with a girl living it in, and that's probably less than half the girls available. It also has 2 maps because the first is too full. Episode 4 doesn't have much in it yet.
It's seriously impressive how much content is crammed in here.