OK, I am writing a complete change on the old mechanics, but bare with me! An event which is littered with Christmas presents on the field. They show up periodically like the the energy blocks in the event. The objective is to collect as many presents as possible. The event lasts for 5 minutes (maybe) and each present you collect adds to your total. If the enemy reaches your base it doesn't destroy your 3 lives, instead the enemy "destroys" 5 presents. The turrets activate at junctures. If you have 10 presents Turret 1 is enabled, you have 20 presents turret 2 is enabled.
What's your thoughts?