Our team has been working on Var and the Vikings - a 2D platformer where you control a squad of 4 Vikings by creating their Behavior Trees.
You decide how they behave and work together, what kind of awesome team combos they can perform and develop countless strategies for your heroes to battle hordes of intelligent enemies. Play our prototype here (use Chrome):
http://var.i.brainworth.net/main.html?l ... oveforward
The final version of the game aims to teach you how to create and design Behavior Trees as you play, so you can apply it in your own games right after playing!