public IObservable <Unit> Execute()
{
return(WaitForRoundStart()
.ContinueWith(Observable.Merge(
_inputController.OnPlayerFired()
.Where(_ => _lastTimeFired < Time.time)
.Do(_ => FireMissile())
.Do(_ => _lastTimeFired = Time.time + cooldownSeconds),
_inputController.OnPlayerMovedLeft().Do(_ => _playerView.MoveLeft()),
_inputController.OnPlayerMovedRight().Do(_ => _playerView.MoveRight())
))
.TakeUntil(DeathOrRoundEnd())
.DoOnCompleted(() => _viewProvider.Return(_playerView)));
}