Retrovaders Good Game, but...
This is a good game, but so was the original which this game is almost exactly like. The only different things are the music and gameplay. The music is an upgrade and is not bad, but the gameplay has changed and has become easier. The aliens do not speed up as more are taken out, the red bonus saucer comes way too much, and there is no record of your highest score.
In the future try to make your own original game instead of trying to survive off the fame and success of others.