It's no surprise to me that it's getting a lot more sales than they expected, and I'm glad to see devs get rewarded for making a quality product.
Nothing else will ever give me the satisfaction of pausing the game, fully assessing the situation, giving a string of commands to all my characters, then unpausing and watching the whole thing play out perfectly (or fail spectacularly).
EDIT: also, the shock of first time seeing Time Stop.