An auto-save of some kind would have saved my error-prone ass. Other than that, the game concept isn't very new. Pretty fun, but kind of lack-luster and often feels slow-paced.
Way too buggy to be fun. I grinded through the whole thing in order to unlock that achievement, and now I feel like punching a baby. Cool concept, terrible execution (how the hell is a flashing screen supposed to make it more fun? It didn't make it more challenging so much as frustrating and annoying).
Good game, but I'd suggest smoothing out the changes in orientation. It always felt like I was being pulled towards the surface and I didn't like it. I think if you made it so that you have to hit the space bar or something before the terrain adjusts, it would improve gameplay and encourage more creative ways of getting through levels.
Fun game. I really liked how slow the shots went, it forces you to time your shots and anticipate where the birds will move. (W00t, #1 score! (if only for a few minutes...))