I think this game requires some heavier streamlining. I would get rid of the corruption and immorality checkpoints, at least early on. You get the "Check out sis running" quest early, but grinding to Lvl 3 takes some time and will probably have you trigger several other scenes, which makes them out of order. I would make the intro much more linear where you're essentially playing a VN and just scrolling through the story. And then when UP decides to make these branching storylines with different fetishes, that's when you can implement your corruption/immorality checkpoints or give the player freedom to go and do whatever.
I mean, I'm at 85 % scenes seen but I have 0 active quests anymore. Am I just supposed to go through day by day talking to people hoping for something to happen?