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Well, it could definately use more. The first 4 levels were a cake-walk. I did feel a twinge of fun at about level 5, where it started to get hard. I eventually died at level 10, mainly b/c I couldnt figure out the cursor, and where the fire was going. You should have a straight shot, instead of a "drop down" type of weapon, so it's not so confusing. Something like a rifle? Maybe you should have upgrades or something.
Anyways, the first 4 levels should just be thrown out. For sound, There should be more sound and a better music loop. For graphics, there should be a way better background. And stick figures? =/
If this is one of your first games I can appreciate this, as it is a decent try. Just learn from (constructive) criticism and improve your next one.
Keep on animating.