I know this is years too late and probably undermining your effort in this, but check out Shadowmatic, it's 99% the same
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Yeah mate, as soon as we submitted and people pointed out this beautiful game "shadowmatic", it's like ultra polished and well designed game on similar concept. They were way ahead of us :D. but we had only 1 day so I'm happy we even finished this one.
Thanks for taking your time to try this one.