Even not searching for 0 corruption, you may like to reject some situations or refuse sexual activities with some characters (like that douchbag of Jamal or the disgusting owner of Kaley's flat ). This will be an understandable way to play the game, but very quickly, you are blocked. The game doesn't work anymore.
It is like you have to follow the lonely road that Nickfifa has define or to stop.
Another remark (that has already been made in this forum) is that whatever decision you take, you see afterwards nearly no difference in the dialogs or Elena's attitude. (you have only skip some scenes).