You don't dare attack this fighter pilot, especially when he is rocking out to his favorite music.
Seriously though, this game has a very simple concept which works fairly well. While it is true the effects can be too much at times and there is very little enemy variety, I keep coming back. Each style of music begins to have its own attributes in this game and can provide different levels of challenge based on the music choice alone.
The concept is so simple it leads one to wonder why this hasn't been done before. Similar things have probably been tried, but this is the first game I have played that has implemented the music so directly. Anyways, it is a neat idea and given that you're not prone to seizures, it is a very good time killer. I paid very little for this game, and I've put more time into than others I've paid triple for.
There isn't much chance for buyer's remorse here, so watch some videos and pick up a copy if it seems interesting to you.