Why does purple go before green on Level 222?

The purple front row opens the buffer space that the symmetrical green wing 20s need.

What should separate two wing waves?

A short yellow or reduced purple lane, never another fresh green 20.

Colony Flow! level guide

hard 6 colors

Drain the purple 15/10/12/13/16 front row before alternating green wing 20s, purple sky stacks, and the lock reveals around the night-sky butterfly.

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Clear purple 15, 10, 12, 13 and 16 while keeping one pad free.
Add yellow 15 after the first purple cards shrink, then clear one purple 20.
Run one green 20 wing lane and wait for the perimeter ants to leave.
Open one lock result, then rotate green 20/25, purple 22/26, and yellow support.
Finish brown outline, peach centre, yellow stars, and remaining wing fragments.

Colors in this level:

Purple, Green, Yellow, Peach, Brown, Cyan

Board notes 5 details

Layout: Purple night sky around lime-green symmetrical wings, a darker green body, peach centre, yellow stars, and a large yellow right accent. Purple 15/10/12/13/16 open first; green/purple 20s, yellow 15s, two locks, and later purple 22/26 sit below.
Goal: Clear the violet sky, both lime wings, green body, peach centre, yellow stars, and yellow accent.
Opening: Drain the exposed purple 15, 10, 12, 13 and 16, then use yellow 15 before a green 20 wing wave.
Danger Zone: Paired green 20s beside fresh purple 20s consume the lock-reveal buffers and bury yellow support.
Mechanics: Mirrored-wing routing board where the purple frame is the prerequisite traffic for the green wing passes.

Why does purple go before green on Level 222?
The purple front row opens the buffer space that the symmetrical green wing 20s need.
What should separate two wing waves?
A short yellow or reduced purple lane, never another fresh green 20.