I believe so far it's only unique dialogue, but there might be a Steam achievement connected to it when it's released there. With minigames it seems that the events are more important when it comes to content than if you make your fellow DIKs happy or not. Without minigames the events are the ones that decide the DIKs happiness, so it doesn't really matter.
With house restoration: The minigame is completely gone. I know for sure that at least part of the result will be if you accept the VIP-card or not when you win Hell Week. If you don't accept it, the money goes to the house.If you accept it, he needs to sell the car.
I don't know if any other decisions let you succesfully complete the mansion or not.