This level is very hard, and shield spheres are quite scarce.
At the start make sure to clear the 2 drones and one green hulk (by turning back).
Then hardest part is the grated corridor near the charger station with two green platformers on the other side. You need to disturb the right platformer to make it turn away or go away, then you must TRICHORD through the corridor (moving left, up and forward at the same time), to avoid serious damage from the rocket flood.
Also you must be quick when you pick up the first invulnerability beyond the blue door, otherwise the green platformers will go roaming around causing trouble when you don't expect it.
From there most enemies can be sniped or can be fought with while you invulnerable or can be avoided when you are cloaked.
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