There have been many Flashes in the DC universe, but they all do one thing the same - run really, really fast. Like, near light speed, reality altering fast. Handling such speed would obviously be tough to put in a game, but we're hoping Wally or Barry or whoever this Flash is remains fun to play.
The Speed Force is where Flash draws his power from, and in JLH he can tap into it for a rush of speed at anyone on the screen. Technically they should vaporize or something, but there's gotta be a challenge in here somewhere, right?