There should be a relic tier item that increases the energy cap by a minuscule amount, like one of those awesome hat things that you can drink sodas from.
There should be a game mode where you can't see very far ahead of you, and you have a super knife that insta kills. You basically run around without knowing where you're going until you get close enough to knife someone. That's be a cool/scary game mode.
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Energy is balanced against too many different things to change stuff about it like that.