A very good stepping stone...
..but that's all it is really. On the good side, I don't have much to complain about, seeing as everything was pretty spot on and well done. Than again, it's such a small game, there's not a lot to enjoy either. And it doesn't have much in the way of replay value. So all in all, still good, but not incredible. Add more everything. Better graphics, an optino to map movement to the arrow keys, different modes and/or challenges. That you could make a game this good is very commendable, just go farther and try harder!