This was actually a great game.
It remembered me a bit of Monstrum: There is an Enemy and you have to escape, in this case, via a boat and you are not allowed to be seen, so hide whenever needed.
The mechanic of the mirror was unique but truly challenging due to it's a mirror. 'Who thougt that'
I would say 8/10, the length was exactly what's needed and like I said, it's unique.
Play it, you won't regret it, i promise!