Not bad
Well, the game concept wasn't bad. The problem was, for me atleast, the speed of the game. By the end of the first level, I was already bored of the game. I spent most of my time waiting for the next target to arrive. It moved too slow, and while maybe you wanted that kind of thing, it didn't really do it for me. Also, all of the targets were easy to hit. I felt that this game wasnt challenging enough.
Also, the plane could have been drawn a bit better. Next time, try maybe using some better graphics, and changing the gameplay to make it a bit more entertaining.
Otherwise, good game.