This is a fun little game. Worth picking up and playing for a bit. I think it could maybe use some unlockable color schemes or something to keep you hooked longer, but the core concept is pretty good.
Additional colour schemes would certainly be a bonus but I'm kinda liking the minimalist almost "lcd-style" aesthetics. I think, however, that sometimes the game can be over very quickly which can be a shame as, continuously spawning 3 new pieces, can make things very confusing very quickly. Perhaps to introduce an option to change this; such as that to spawn just 1 new piece (as in solitaire), or 2, would allow people to adjust both the difficulty and length of the game.
One of my favorite developers releases yet another fun and interesting game--yay! I am intrigued by the idea of adding color. If you decide to go for it, it will be interesting to see what you come up with. But if you decide to not add color, it's perfectly wonderful as it is. Well done, yet again!