I completed through #6, though that one was tough for me to picture in my mind and predict things ahead of time. It required a lot more experimenting with different pieces until I found one that I could place. I mostly did dragging, though realized that there were a few times that a direct swap would have been better. The designs were neat, though could be challenging. The flash when you get a piece into the correct position is convenient. The level progression feels challenging, but reasonable. The options in the menu are nice to have. Overall a decent puzzle game.
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Yes, the 1st Mandelbrot. I'm fine with it where it was. I think it was just the way my mind was processing the image. It was a challenge, but the systems in place gave enough freedom and aid to allow players to work with it at their own level, and to skip past it if needed. If not for the aids, and being able to skip, then it might be to tough and stop some players. If you add more puzzles, then I could see adding more earlier and building up more slowly to it, but with what is there it felt fine.