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 :)