I liked the core mechanic, it remembers me of Snakebird. Having to dig is interesting, but sometimes it feels unfair when a column goes down. A couple of graphical improvements could help to make the game clearer, and background music along with sound effects can set a proper atmosphere. I see this as a good starting point for a puzzle's game (which is one of my favorite genres). When the game is at full screen, the texts look blurred.
- - -
You already played our game: Blind Bird, so we can't do anything but thank you. 」(￣▽￣」)