There's an excellent story mode to play through, with progression, power-ups and quests to find and do, and if you finish that, there's a survival mode as well, complete with Game Center achievements and leaderboards. Just as you'd expect from Imangi, the folks behind Harbor Master (who recently updated their original app with Retina Display graphics just for the heck of it), the quality is excellent all around. The team at Imangi has put a whole lot of love into this one, and it shows.
At the introductory price of just 99 cents (for the universal app!), Max Adventure is a bargain, even during the crowded holiday season. Odds are you've already picked up a few games this year, but even if that's the case, go find another buck in your couch because this one's a must-buy.