Alright.
It was pretty easy.
Nice concept though, easy to grasp, nice to play.
Maybe, as others have said, make more power-ups.
Or make the instructions clearer? It took me about ten seconds to figure out what block to press.
But, I'm a bit slow today, so maybe that was just me.
This was the first game of block sweep I've played, and it was pretty good. Well done.