I bought this at half off during a Steam sale, and it was worth the ~$4 I paid...HOWEVER,

1. This is an *extremely* short game--took me about 90 minutes to finish the main game itself (add a few more hours for getting all of the achievements if you're into that sort of thing).

2. The game is heavily story-based. The story here is actually very good, IMO, but if you don't happen to find the story intriguing, you're probably not going to like the game.

3. The actual game mechanic is *extremely* repetitive and simplistic to the point where it's barely a game.