Muv-Luv Alternative definitely makes the winner of this month and, despite my worries, I enjoy it a lot so far, somewhere between 9 and 10. The only other game that can be called a masterpiece this month is Moshimo Ashita ga Harenaraba . I'm choosing AR ~Wasurerareta Natsu~ for review just in order to reveal its very vaguely described plot.
The VN of the Month is I/O, but that's a great start of the year. I also consider Fragments Blue a masterpiece. For some reason I chose Horizont for review among games without English review.