What square opens Meowdoku Level 191?

Pink at row 8 column 6 is the first real release. After that move, blue can safely take row 6 column 5 and the left half finally becomes readable.

Why does the orange block wait so long in Level 191?

Orange at row 7 column 1 still clashes with the right side until blue r6c5 and pale green r4c4 are already pinned.

Meowdoku level guide

hard 6 colors

Meowdoku Level 191 clears once pink lands at r8c6 and blue follows at r6c5, letting the left half finish from purple r3c2 through orange r7c1.

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Keep the preset cat at row 5 column 8 as the permanent right-edge anchor.
Place the pink cat at row 8 column 6 to break the lower-right diagonal squeeze.
Use the opened lane to place the blue cat at row 6 column 5.
Drop the purple cat at row 3 column 2 once column 2 no longer conflicts with the right side.
Place the pale-green cat at row 4 column 4 to stabilize the center bridge.
Finish the orange block with the cat at row 7 column 1.
Close the board with the dark-green cat at row 1 column 3.

Colors in this level:

Dark green, Pink, Purple, Pale green, Blue, Orange

Trying to solve the orange lower-left before blue r6c5 is already fixed.
Saving pink r8c6 for the end and leaving the whole right side diagonally locked.

Pink r8c6 is the real opener. If that square is still empty, the left half is not ready yet.
With 6 colors in play, clear the pair with the fewest blockers first so the board opens up instead of tightening.
Think in chain clears. The best move is the one that sets up the next two moves, not just the quickest current match.

Board notes 5 details

Layout: This 8x8 board has a dark-green shelf across the upper-left, a pink cap on the upper-right, a single purple pocket at r3c2, a pale-green bridge in the middle, a blue stack on the lower-right, and an orange block on the lower-left. A preset cat is already fixed at r5c8.
Goal: Use the preset cat at r5c8 to anchor the right edge, then free blue r6c5 so the left side gets legal finishes for purple, pale green, orange, and dark green.
Opening: Leave the preset cat at r5c8, place pink at r8c6, then use that release to claim blue r6c5 before touching the lower-left block.
Danger Zone: Trying to finish orange before blue r6c5 is fixed keeps the lower-left diagonally tied to the right side and steals the dark-green top finish.
Mechanics: Level 191 is a right-edge anchor board where the solve only opens after the pink and blue placements settle the lower-right.

What square opens Meowdoku Level 191?
Pink at row 8 column 6 is the first real release. After that move, blue can safely take row 6 column 5 and the left half finally becomes readable.
Why does the orange block wait so long in Level 191?
Orange at row 7 column 1 still clashes with the right side until blue r6c5 and pale green r4c4 are already pinned.