This game is very simple, with the entirety of it's content lasting a whole 30 seconds. Basically, you have 20 shots, and it really doesn't matter what you do with them whether you fire them all into space or hit 20 ships, it just gives you the play again button. As far as criticism goes, it's obvious that your new to this, and that this may be your first attempt ever at creating a game, and you succeeded at that, however, reading the author comments takes more time then playing the actual game. I recommend you take what you have that could be turned into the story for a decent game and go learn more about making games, there are even plenty of authors of very successful flash games that are nice enough to post tutorials and offer help to people new to game-making.