In short, this is a very well-designed game and one of those perfect "pick up and play" apps that is sure to keep casual gamers interested for a while. It's free (at least the first four levels are) so you have no excuse. It's almost launch time.
Astronut's developers clearly understand how to design for a touch-screen device. All the menus are well-organized and easy on the eyes, as is the actual in-game art. I particularly liked the collection mechanic.