Kinda novel but...
It needs that extra something to seperate this from just another sound player. Mouseovers perhaps, button pressing sounds, better buttons to switch between the games, better graphics other than the ripped sprites. Add that and I think you got yourself a winner. BTW, I liked the preloader with the different bosses, my only other advisement there is to let people know they can do that while it's loading. Pretty it up a bit and things will be great.
~Real reviews are the key!
Wayne