That's way to cheap for what you're getting. Well in any case, if you haven't gotten it go get it now. It's a keeper and it's staying on my device for sure.
Still waiting to see if the price drops on Android, don't think it ever has. Have this on iOS but my Android devices have bigger screens which would suit this game. Also this isn't the lowest it's been, if I remember correctly it was free for IGN's game of the month a short while back.
Embarrassed to say I had kept putting off grabbing this one due to install size on my device, but with this price drop I can no longer fight it - deleted some apps and purchased!