STP writes: "There is great replay value in obtaining achievement commendations, and it's a blast competing with your friends' scores via Facebook and Twitter. We spent 2 hours on the first level chasing perfection (if just one S'rath slips through the fold, that's too many for us). And with seven levels in all, we'll be busy for some time. The promise of future in-game expansions attests to a dedicated development team. And for $5.99, this is an investment that you'll feel good about. Simply put, Star Defense gets a well deserved "Must Have." Download this one today".