Well, frankly, this isn't very much to give critique about. Why do you need 'simple graphics'? if it's out of laziness, then try it the hard way at least once. If it's because you're experienced and you want it to look like that for style, and it's for a game or something, then that's cool. But if you're trying to practice your pixelart this is not where to start.
Sooo.... What's this for?
Crits:
Right now, the movement is very unnatural. Make it a more pendelum-like swing, making it slow while its farthest out and fast while it's in the middle.
Otherwise, I can't crit on this. There's really not anything to crit on.