I’m sort of enjoying it. Sort of. The way the colours are often too similar puts me off a bit, and the way when you have just one colour of block remaining (and yet the game throws other colours at you that you can’t use) is really annoying, but it’s fun.
I played through 1-B to 1-F, and then 2-B today. Some were harder than others, but only in that I struggled at the end and often died. It seems if you don’t get Bonus Time when you’ve only a few blocks remaining, you’re buggered.