I don't understand the logic of when I get energy and how much. I'd also like my upgrades and unlocks to remain available without re-purchasing them. Do they break again or what?
Died day 20 with all the upgrades and 22660 money. Needs recharge upgrade, secondary tower fire rate upgrade, chain lightning arc extension upgrade (chains jump farther), in-level repair option, maybe a repeater so ground and air can arc together in chains. Oh! and basic damage upgrade, not just capacity.