Under the Moon is a neat and short game that keeps a good consistency of quality despite having no text, words or over-the-top graphics. The game shades nicely with black, and the last two sections of the game are nice, once you learn how to navigate them.
I assume the story is that the purple one seeks out a heart to love the green one. Either way, it wasn't a bad experience. It's also surprisingly large for a game created in five days. Also, thank you SO much for using the music you picked. It's so refreshing to hear original tracks getting spotlights.
Tl;dr: The game doesn't have anything to special, but the final two areas are enjoyable if you like navigation puzzles, with a nice soundtrack on top.