Find the Cookie and click on it, and gain a level up, the higher the level, the higher the reward you get after the rounds over. Extra enemies do Not boost your rewards, neither does Scary mode or Ultra Challenge mode. Speaking of enemies, you must be careful of the Thing, aka a flying mouth with eyes. You should also be careful of the extra enemies, as they could either throw you off, or destroy you on the spot.
[DISCLAIMER] Enemies can spawn right on you, this is because their position is randomized. OG by @HampsterSpiderman Menu by Me Cookie and THING models by Me