You're a girl on her first day of high school, but you've got a problem greater than friends or horrible teachers on your hands: your reflection in the mirror is threatening mutiny.
The first thing that strikes me is that it's a very aesthetically pleasing game. Visual elements are used to great effect. The evil mirror-self is shown in the reflected text which changes, not very subtly, to insert negative thoughts about a situation; the text changes when you click through links to reflect what is presumably the PC's insecurity and anxiety about her new situation. There’s a whole lot of clicking through, though, not all of which I thought was strictly necessary.
The content - family life, high-school social minefields - is very much the stuff of many teen fiction novels, and what should have made it impactful would be the presentation of the evil mirror-self, but the goal of the game was probably nothing overtly spooky. Rather, it was more about the internal emotional conflict of the PC.
So far I've found two endings, (Spoiler - click to show)the triumphant and doppelganger one. I found the confrontation well-written and personally it struck a chord with me, though there was little to build up to this. The endgame could have been much stronger if the PC had been less generic. If we understood a bit more about her fears and personality, then it might have made the triumph feel more like one. That said, I enjoyed the sly ending (though really nothing surprising to one who reads horror fiction so often).