It's pretty well executed. The basic idea isn't groundbreaking, although it was nice having some things attack from the side. You had a good variety of hazards to tackle, and the difficulty ramp was pretty good.
There are some nice, old-school sounds. It was rewarding to absorb the blocks as you passed them by, but it is a little mixed-signal-sending. My first time through, I thought I was supposed to go and collect them...until I died. Even after that lesson, there's still this weird feeling that you get when you are trying to avoid them and they suddenly start coming toward you.
It was pretty addicting.