Go to the time machine, but after lvl 190 XP required to level rise up ridiculously fast, and while bonuses get relatively smaller with each of their levels, their price also rises prohibitely steeply. All in all, fun idea, but one just has to wait too long without being able to do anything about it in later stages.
Tuning down required-XP-to-level and prices on higher levels of bonuses would help the game immensely.
Hold "A", bump mana to "up to 6,5k", release "A", press "Q" repeatedly to send a squire swarm, repeat on all levels. Might consider upgrading the arrows turret at some point. Sooo... Why exactly am still playing? :D
Needs something to be attractive - buying upgrades, for example, instead of just receiving them. Way too easy, too. Also, on a side note: "frag" means a kill on an ally, not on an enemy.
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