(+) Start Menu with basic Credit
(+) Music that emphasizes the theme
(+) Interesting little puzzle game that requires both keyboard and mouse
(+) I like that there are hints available in game if you know where to look. Although some of these are more helpful than others.
(+) Lots of Level!
Great game, I haven't finished up yet, I'm stuck on 7/12/13 level, but I'll work on it.