okay, never mind. I can definitely see how the time limit adds the element of forcing the player to act aggressively instead of running away, and how swarming the player would essentially disable the main mechanic of building up momentum to deal higher damage.
Thanks for leaving a comment and giving feedback! :)
We hoped the game would challenge players to keep trying. If you survive long enough, you will end up being swarmed. Every 30 seconds you survive the enemy spawn cooldown gets lower. After surviving for 4minutes an enemy will spawn every 2seconds ;)