I was really enjoying this game, but just a warning for people playing that it is easier than it suggests to get trapped in an unwinnable state without knowing until you've played so much past that point that it just wouldn't be fun to go back and re-do it all.
It was frustrating especially because it felt like I was being punished for solving a puzzle early than I was 'supposed' to.
It would be a 4 or a 5 but while I don't mind difficulty, but it just stopped being fun when I could only work out the game was now unwinnable by googling hints / solutions and realising that there was simply none.
Personally I would prefer being locked into a 'bad ending' than just being stuck with no way of progressing to the next day and no in-game way of realising why...