OKAY here's my personal favorite idea so far, I'm gonna list my ideas for game mechanics please tell me what you guys think.
the DANCE CONTEST ONLINE GAME:
All the players are on a dance floor together. Their goal is to accumulate the most points before the timer runs out. Your points are multiplied if you're standing in a spotlight or some place where the judges can see you better. At the end of the round the judges announce the winner.
Special moves:
Impressing people with Special Dance Moves would increase your score, and you could unlock these in different ways. How we decide to implement them in the game would be a large contributing factor to how the gameplay finally winds up working. Here's some ideas for them:
Depending on when you use them you would gain more or less points.
Some moves might have a charge-up time and/or a cooldown time.
Perhaps some moves require you to be the first to grab a power-up.
Some moves could also allow you to affect other players, for example, a spin-move that knocks people away from you.
User-Specific Powerups:
There would be powerups that increase your score that are only visible client-side. Opponents couldn't interfere with them and they would be challenging to collect (perhaps you have to hit a button with good timing to collect some of them). If your opponent DID interfere with your movements, you might risk losing points, which adds strategy because you could decide whether you should try and interrupt your opponent or just KEEP ON DANCIN'!