Very enjoyable and polished puzzle game!

I've had some trouble understanding the mechanics at first, but after reading all 5 pages of instructions, it became clear :)

When it comes to UI, I had trouble finding the "enter"/"accept" button at first, and after a few tries I realized it's the "C" key. Other keys were marked very clearly. 

When trying to play with a mouse, one thing I missed was dragging the selected tiles :)

I had fun while twisting my brain on this one. Good job!

This was a great spin on a cool puzzle game. Bringing it into a more complex grid feels like it adds something significant to the game.

Appreciated the symbol options, although my brain keeps parsing the red symbol as being a square on a rotated tile rather than a diamond shape. The purple tile's symbol also didn't read well as a combination of red and blue.

I found myself wishing I could click and drag to move, and right click to deselect, but this wasn't a big deal for me.

All up, a nicely polished and nicely presented submission. Well done :)