For 1v1 it might be a tad tricky, but I love coop games and think it'd be worthwhile to explore that avenue.
What about a version that plays like HORSE. Where you do a combo, and if they can't do the same combo in X tries, then they get a strike
I like that idea a lot. One of the best ways to do multiplayer with this kind of implementation, or even a combo of the day with leaderboards.