Why is dark purple 40 delayed?

Its route crosses the lower key area; the yellow 16 and pale-cyan 30/35 returns must leave a hole so the colored locks can open.

What remains after the musician looks mostly gone?

The pale-cyan sky branches, yellow instrument, brown head/tail pieces and dark-purple border still need their final matching routes.

Colony Flow! level guide

hard 7 colors

Route the brown-haired saxophone musician through linked green and brick-red stacks while protecting a white buffer for the dark-purple key lane.

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Tap brick red/brown 32, then green 16 and green 17; wait for the paired green return before using green 10 and green 9.
Route brick red/brown 34, pale brick 32, pale brick 35 and brick red/brown 32, leaving one white buffer slot free.
Tap dark purple 40 after the brown ants open the lower route and let its long stream finish before filling the key lanes.
Use yellow 16, pale cyan 30 and pale cyan 35 as their holes return, then route green 30 without blocking the red lock.
Clear brick-red cards 14/24/21/19/7 and the later 12/4/2 group while the brown body separates from the cyan background.
Open the colored key lanes and use green 18/4, yellow 21/16 and pale cyan 30/32 to remove the instrument, face highlights and lower sky pieces.
Finish the remaining dark-purple 40 and small dark 9/11/12/14/16 cards only after the lower border is clear; wait through the crowded return.
Route the last brown and pale-cyan pixels around the head and tail, then wait for the final ant stream and empty-board clear animation.

Colors in this level:

Brick red, Brown, Green, Yellow, Dark purple, Pale cyan, White

Starting dark purple 40 before a yellow or pale-cyan lane can return leaves the key route blocked.
Tapping another brown 30-plus stack during the lower-border ant return strands the last saxophone and tail pixels.

Use brick red/brown 32 and the linked green 16/17, 10/9 opener before touching the long dark-purple lane.
Leave one white slot empty through dark purple 40 and the first colored key release.
Wait for the crowded lower-border ants before tapping the short red/brown endgame cards.

Board notes 5 details

Layout: A brown-haired musician with a yellow saxophone or large yellow instrument, reddish-brown clothing, a pale-cyan sky and dark-purple left/lower borders. The opening queue shows brick red/brown 32, green 16/17, green 10/9, brick red/brown 34, pale brick 32/35, brick red/brown 32, yellow 16, dark purple 40, pale cyan 35, green 30 and pale cyan 30, with colored key locks below.
Goal: Route green, brick-red/brown, yellow, dark-purple and pale-cyan cubes through their matching holes, open the colored key lanes, peel the musician and instrument, and clear the final cyan, brown and dark border pixels.
Opening: Tap brick red/brown 32, then green 16/17 and green 10/9, waiting for each linked pair to return before routing brick red/brown 34, pale brick 32/35 and brick red/brown 32.
Danger Zone: Dark purple 40 crosses the lower key area while yellow 16 and pale-cyan 35/30 are still visible. Keep one white buffer slot free until the first key release and do not stack another brown 30-plus card into the same route.
Mechanics: A multi-key, multi-stack pixel-art board with heavy perimeter traffic that separates a complete musician into sky, brown body, yellow instrument and dark lower-border fragments.

Why is dark purple 40 delayed?
Its route crosses the lower key area; the yellow 16 and pale-cyan 30/35 returns must leave a hole so the colored locks can open.
What remains after the musician looks mostly gone?
The pale-cyan sky branches, yellow instrument, brown head/tail pieces and dark-purple border still need their final matching routes.