The gesture detection is actually not that bad: https://github.com/britzl/famicase-rps/blob/master/game/gesture.lua and the definition for a symbol/gesture like this: https://github.com/britzl/famicase-rps/blob/master/game/rps.lua#L20-L32
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Well done to cover three themes in one. I think the horizontal movement could have benefited from some inertia. Interesting concept with the hint at what's coming in the next section, but I'm not sure how much it helped me.