The game may have ended with Tiny Wario, but that doesn't mean that's all there is to see. Woe to the person who puts the games on the shelves right after the end credits roll! Besides, I haven't even shown you the end credits yet.
The most prominent thing you'll notice after you beat the game is that Dr. Crygor's back--he's had a stage in every WarioWare game before this, and he's not going to let you go by without introducing himself once again. The mad scientist, this time, has partnered up with his karaoke/janitor robot Mike invented the Kelerometer...and for some reason, grew breasts. You can never tell what's going on among these mad scientist types.
The Kelerometer recycles Microgames, picking the ones that require a high amount of energy. Your score this time, however, is not based on how many Microgames you clear, but how much energy you expend on them, whether you clear them or not.
The score I have here is far from the best I can do, but this is pretty much just to show what this stage is like.