I liked the thoughtfulness with the backstory to the puzzle game and why the artwork is what it is. The music was very fitting for the gameplay, too, and very soothing and enjoyable.
I was unclear what I was supposed to do. Make lines with the same colors? Make larger squares? I was also unclear what the powers were. I learned white destroys, pink and aqua also destroyed when stacked with their own. I also found that I could slide squares into other squares at times, regardless of color. I wasn't sure if that was a bug, or some property of the way I arranged the colors. Some starting gameplay guidelines would be useful. If the player is to learn as they go, maybe having text pop up as they achieve special things would be helpful as well.
It's clear a lot of great work went into this. Nice job!