[quote name='MidnightRain']I put about 8 hours into this, completing all 29 levels with a few replays of the regular missions and then a few levels in Score Attack mode. You can easily knock it out as a rental, but for me, it has enough replay value to stay in my collection. I picked it up last month for about the same price and feel that it was worth it.[/quote]
I've put 5 or so hours into it and I'm about halfway through.
I can't wait to revisit some of the earlier levels and unlock eternal mode for them. Getting through the level is really not the same as finishing it. Like all good games, it always leaves me wanting more.
I also replayed one of the town levels last night, and had a completely different experience than the first go-around. Somehow I didn't improve my score, but I feel like I could play it several more times and I would see different things each time.