Best strategy: all classes except Ranger go with their Rune ability; Ranger goes with the wings. Take any class until you get the Ranger, then keep the Ranger. With the ability to fly and shoot blocks, it's very difficult to get trapped. It's also one of (if not the best) classes for fighting bosses.
So glad to see this come to Kongregate after playing through 100% completion on Ninja Kiwi. I really hope this game gets some badges, because I'm looking for an excuse to play it again from scratch :)
Pretty fun game. I was confused at first (I thought you had to click the the white things) but after that, it made sense. Simple concept but very fun. 4/5.