Great game
Calling this a Super Smash Bros. rip-off would be like calling Half-Life a Wolfenstein 3D rip-off. As is the case with games like WarioWare, the genre may have been created by one game, but it's still just that -- a genre.
I saw a video for this game a while ago, and my only hope was that it would play as good as it looked. The fact that the gameplay is just as polished as the graphics speaks volumes to the amount of work that must have gone into this game.
All I can say is "congratulations" to the team behind what will undoubtedly become one of the biggest hits of the Flash world.