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This example is using box2d for something that can be implemented with very simple code dropping this important dependency IMHO. Box2d is a great fit when real 2D physics simulation is needed, but for apples falling at constant speed and jumps, it's not worth it.

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There is also this simple game using box2d in both Clojurescript[1] and Coffeescript[2], which can also help those starting with it. I wrote a little abut it[3].

[1] http://danielribeiro.github.com/ClojureCoffeeScriptGame/

[2] http://danielribeiro.github.com/ClojureCoffeeScriptGame/cloj...

[3] http://metaphysicaldeveloper.wordpress.com/2011/08/28/clojur...

This example also has bugs. 1. Rapidly pressing up executes multiple jumps. 2. You can climb up the side of a block/group or just get stuck on it.

Also the jump feels off.

the climbing on the side of the block is actually default box2d behaviour with bodies having friction. to make it slide off the side needed a bit of complex construction which i avoided to keep the tutorial simple.

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