Yes, I downloaded it and had a quick look. To be honest, the game seemed too complex for me to learn how to play via a readme file. I spent a few minutes trying to wrap my head around it, then decided I'd try just starting the game and clicking around to see if I could learn it that way. I have to admit I gave up pretty soon though - puzzle games are not for me.
I realize an in-game tutorial is probably on top of your TODO list. How about a YouTube video that teaches people how to play, in the meantime? Or a PDF with illustrations? Anything but a wall of text in a readme.
BTW, I think the visual similarity to that Rubik's Magic thing is not a problem at all. Nothing wrong with conjuring up childhood memories, and I think it was a pretty obscure toy anyway. I really like your minimalist approach to the graphics. The game looks very nice!