Every shift seems to get me more and more frustrated, for this game is like this is the only lvl. It gets harder and harder, and a new game is put out beofre I've beaten the last.
I've beaten all four of them and I need a new one to beat! I like the multiplayer idea. Maybe not only keep that in the regular part, but in the builder as well?
I think AG should bring the game to the next level.
For example cooperate with "Metanet Software" guys (http://www.metanetsoftware.com/) - creators of "the way of ninja" (http://www.thewayoftheninja.org/) and create something like "n: shift".