Thank you for playing! Yeah you are right it is confusing, Day 7 passes into 6 the same night and then you sleep into 5. It isn't very clear was a bit of a mistake and will be patched into simpler day to days.
There are 3 endings, the last is very hard to get currently, much like making a perfect game in real life it is quite impossible currently.
I will also patch this.
I made this game in 7 days, just like the protagonist and got quite stressed and driven quite mad over the deadline.
Several of the events of the game are real life events that occurred during production.
With a big update this month I shall fix it, make it better and make it more beautiful.
It is my purpose.