My friend and I just did beta yesterday with 2 top level rock drakes and 298 shotguns. We still had about 12-14 minutes left on the timer when we finished. We never used the cloak or anything, the reapers and nameless that spawn are super easy to kill if they become bothersome but we honestly just ignored them for most of the fight. Are the balls removed from all difficulties now? There were no balls in gamma or beta at all.