A short, multiple-ending VN with a simplistic art style.
If you happen to find the story weirdly interesting or want answers:
There is a LOT of hidden subtle / not-so-subtle details in every part of the game, and in tandem you can get a good idea as to who Moon may be and the world she inhabits. (If you do find it interesting and want to know more) A little forewarning - things are not as they seem, nor as they seem that they seem.