Yeah, the problem simply comes from how much power the upgrades give you versus how much health the enemies have. I had about 40 minutes to come up with the formula, so I didn't have time to come back and rebalance everything. Although spamming spacebar shouldn't work on 'Observant' and 'Airhead' guests. But since elites are also a bit sparse... Those are things I'll fix once the voting phase is over.
Thanks for the review!