I'm almost finished with the single player campaign and haven't seen a single replay even after killing 3 or 4 worms in 1 turn, is this feature not implemented?

I'm almost finished with the single player campaign and haven't seen a single replay even after killing 3 or 4 worms in 1 turn, is this feature not implemented?

I have seen a couple replays usually I did more than 200 damage spread across a few worms.