First game I played when submissions closed. Somehow I had never heard of WarioWare or this micro-game genre, so it's difficult to extricate my experience with this game from my first experience with the genre as a whole. But it was a great. The messages from chat are a beautiful touch.
I might be biased because I saw this one first, but if only one game of this type makes it through to top 10, I hope it's this one!