You'll have daily campaigns (~3000 imperials/day), Battle with friends (~200 imp/each friend/day), and income from your Island (~200/each land/day). Expland your island, conquer another players' lands and have an income.
@ Plixus You just told me to use an office spread sheet to plan the minutes you are able to play. That is preposterous. Not everyone has such a menial job as you evidently. The loss of energy is not insignificant. If it was expressed in money terms (since you can buy energy) I am sure fewer people would down vote me.
I think it is unfair that you lose your remaining energy when you level up. You are supposed to be rewarded for leveling, but you actually are losing a fair amount of energy when your bar re-fills and you have no control over it.
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 "Deep Sleep")
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 "Cloudstone")
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 "DuckLife 4")
 "Red Crucible 2")
 "Versus Umbra")
 "Brute Wars 2")
 "Raze 2")
Thanks for your suggestion! Button removed.