Azinth: if I manage to maintain my chain up to the big central building before the tank midboss in stage 2, I would (iirc) laser the left side, then the middle, then the right, then attempt to laser the tanks that come at the right side from the building (dunno if it's better to destroy the tanks that are immediately spawned to increase the chain meter and then damage the central building, so that if it's destroyed, you have less chances of missing your chain before hitting the spawning tanks again before the large tank comes); dunno if this sequence is possible, because I haven't thought of it until now

(and Prometheus' replay apparently sacrifices his chain in favor of bee collection, and doesn't do like I say

)
Donut: for the 3rd stage, when you reach the big red carrier..
http://www.youtube.com/watch?v=PTOHnUALJOI#t=7m20s- there will be flying enemies that will shoot aimed shots, just keep moving from one side to the other while shooting/lasering
- the turrets that spread 3-way shots shouldn't be dangerous, as their shots are slow (and predictable, if you're expecting them to appear)
- the turrets that shoot aimed streams of slow laser shots shouldn't be able to corner you (as they're fragile), just keep moving like you did for the ships and lasering them
- the turret that fires bursts of bullets while turning around will always start shooting at the left; don't worry with what side you should be, align yourself to the turret as soon as you see it and destroy it, you should be able to safespot it if it's needed (that is, just dodge the burst that's fired straight downwards)
- there will be one more turret like the one you've just destroyed, along with 4 turrets that fire straight downwards; these 4 side turrets aren't dangerous, as your laser has a large (I mean, wide) hitbox if fully powered, so you don't have to align yourself entirely to destroy each of these. Perhaps you'll want to destroy the central turret first if you for some reason can't destroy the side turrets on your way
- surprise, one more of these central turrets ^^ (surrounded by two power-up dropping ships)
- against the following double turrets, you'll have to choose one (I always choose the left one) and laser it before it can shoot (iirc), the other turret won't be dangerous if it's alone
- immediately after these twin turrets, there will be four turrets that can aim at you. Destroy these as soon as you can.
- and immediately after these, there will be cannons that fire bursts of bullets downwards, placed on both sides, and a central.. turret-thing that fires aimed lasers. You can lure its shots and then damage it until it's destroyed. You'll have enough time to destroy the remaining cannons if you want

Dunno how the 5th and the 6th stages are done, though..