This is a very fun little game. I think my biggest complaint is the controls; I get that with the spaceship *and* the shield its a lot of actions to cover, but I don't think the mouse-follow style is a good solution. When your ship reaches the mouse pointer it stops, which doesn't feel good and makes dodging hard. Perhaps the shield could rotate auotmatically, freeing up some keys? Maybe it could move rhythmically, or the way it moves could be modified by powerups?
Either way I enjoyed it. I'm also going to go against the grain and say its not chaotic enough, make it harder :P