Thank you! Yea the enemies do spawn faster as the game progresses but I had a hard time testing for the difficulty. It was mainly the card upgrade system that made me unsure of the challenge it should have. That does seem to be the best strategy for this; an idea could be that maybe if you stand still for too long it starts removing control time because you aren't using it as much? also once again Thank you! It would be cool to re-balance it and such sometime to make it better.