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Eye-catchy game!

But my brain simply can't process the matching :P 

I think it would be more playable for everyone if it were rock, paper, scissors like you said, even a little kid could play it without any tutorial at all.

Regarding the help section, it'd be better if there's Next/Back buttons to navigate instead of its auto transitioning to the next image so I don't have to play it many times to get the matching.

On HTML5, you can map it to the 1 2 3 or A S D (whatever) keys for faster reactions.