I did beat the last level, and at that point I finally figured out it was a rotation going on. Just forgot to mention it, I was getting a little tired. I'll describe that my finishing touch for getting each piece together(on last level) was by putting a tile close to the 'target' area and then using an ouroboros(wrap around with an L shape, then eat and go in circles) on the object to rotate it in a 4 square. Thought that may be interesting to you, if you assumed people would play a certain way.
I was doubtful about how much the player would get from the mechanics and the puzzles since I'm just putting them there
Felt fairly straight forward for the most part. I took it as a challenge, like those Rule Discovery puzzle games you may know about. Though, right now it's quite simple so there was less to chew on. I really like that genre, but if you want to lay out the rules so more people won't bounce off I can see that too.