Well, it was pretty good- not fantastic, but pretty good. It controlled well, and everything worked as it should, but, really, it's just a time-waster. There's not a whole lot going on here, making it likely I won't come back and play it again.
What I liked:
Controlled well
Able to choose your own control scheme (that's fantastic)
What I didn't like:
It's very, VERY easy
The top of the screen kills you (biggest fault)
not much depth