Interesting idea. Sometimes I was able to double-jump, and other times not. Am I supposed to always be able to wall jump? Was there some technique I was not understanding?
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Glad you liked the idea! Wall jumping is a feature in the game, I didn't have time to implement a tutorial sadly and resulted to leaving a quick tip on the Game Page. If you jump next to surface, break away from it and then come back to it (and then jumping again), you'll wall jump. I wasn't able to get it feeling right due to lack of time, and thus its slightly difficult to pull off.