This is a really simple concept that plays extremely well. I didn't expect upgrading shapes and the changing of the shooting pattern to make much of a difference but it does make you think. I am also a sucker for minimalistic games and art styles so +1 for that. Would like to have seen some work put into the main menu so it fit the rest of the game. Also would have like the game to have an endless mode or to play longer because I was enjoying it and then I won. Nice tight little game loop though!