Additive

Nice concept, the use of black tiles is unbalancing. Instead of figuring out primary and secondary colors and how to mix them to meet in the middle - I just tried to figure out how to make the black tiles delete everything else until they met up, then joined/deleted them

Oh heaven, kittens! Very nice game, although it is indeed more about making the black tiles delete everything and meet up, instead of figuring out how to combine the blocks to meet up with the black ones.

Very nice twist on a sliding puzzle & color match game. Very nice, indeed.

very nice! and I absolutely love the sound of piano keys! (one suggestion - perhaps you could use different key sounds for different colors?)

"May a thousand kittens mew at your passing." So...hope a bunch of cats meow when I die? Also +1 to Lotherio, the black tiles do indeed break the game. What could be a process of carefully mixing and upgrading colors to finally meet becomes combine outlying tiles and then gobble everything up with the black squares. A better mechanic would be to remove the black tiles entirely and have lower level colors (red, blue, green) become the higher level tiles (yellow, cyan, purple) with those tiles canceling each other out as the black tiles do, with the win condition of all tiles being cleared remaining the same.