At a "casual game" price, this might be a winner
Based on my playing of the demo, this is a pretty game with decent replayability, but it's more like an offline version of a fun Flash game, the kind of thing that goes for $1-5 on the iPhone, or up to $9.95 on a desktop machine, but at $19.95, it leaves a little to be desired. For that price, I'd expect a level editor, or some other value add. That's just me, though. 3 stars for a quick fun game, -2 for value.