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It's a good start. Obviously this isn't a best seller, but by your own comment, it's not meant to be. Some things to watch out for are details, such as making sure that lines of enemies don't overlap one another, and maybe adjusting the difficulty curve. In addition, consider making an option for the user to choose between the spacebar and the left mouse button, because in the way it's set up now, my hand feels somewhat cramped. Otherwise, not a bad game for a beginning developer.
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for only two weeks of practice you have done amazing but you may want to refer to http://www.flashkit.com/tutorials/ for advice and more learning
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I only started making games a couple of weeks ago, so the game obviously won't be perfect, but constructive criticism (or praise :P) is welcome, and and suggestions will be taken into account.
Enjoy the game :)