My level "Architect":
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@Kaseladen, that delay is the cooldown. After the attack 'recharges' from red to blue, there is a cooldown, actually, more like a stop, to preventing you from spamming vortex.
@kcbc123: Actually, that's not all you need. There will be situations where you may need other weapons too, like the Energy Homing, which causes one hell of a havoc combined with 4-homing.
Give you a tip guys, buy the 4 homing and the energy homing missiles, then spam all 4-homing til it gets red. Put out the energy and spam them til it gets red. Repeat.
It's useful for almost every level.
It's fun, but when you get the homing/energy missiles or the revert, the only thing you have to do is spam missiles, then when missiles are low, change to revert, and so.
4/5