Why is the lower frame still standing after the blue crown falls?

The orange horizontal beam still links three separate legs; break that beam, then the narrow center leg between the cyan panels.

What should I break first?

Start with the left and center blue droplet blocks in the tiered crown.

The tall orange-red post on the far right and its nearby cyan base piece survive the longest; clearing them leaves 4 of the starting 29 balls.

Smash Fest! level guide

expert Target: 25 moves 4 colors

Strip the tiered blue droplet-block crown, then dismantle the wide orange-red star-crate frame and its stubborn right post with 25 fired balls.

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Shave off the upper-left blue cap, then continue into the middle droplet row instead of shooting the orange frame.
Break the lower-right blue cluster beside the striped ball and wait for both balls and loose crown cubes to fall.
Hit the orange horizontal beam immediately under the crown to expose the frame's three separate legs.
Break the narrow center leg between the cyan panels, then remove the left star-crate leg.
Open the central lower compartment by striking its orange diagonal brace and adjacent crate.
Pause while the released blue cubes and striped balls roll across the platform.
Finish the tall right star-crate post and cyan block at its foot; 4 balls remain.

Colors in this level:

Blue, Orange, Red, Cyan

Attacking the lower frame while the blue crown is intact leaves its central supports protected.
Shooting a rolling striped ball wastes ammunition needed for the tall right post.

Sweep the left and center of the blue crown before touching the orange-red frame.
Wait for both striped balls to roll clear after the crown breaks.
Reserve the last shots for the tall right star-crate post and cyan base block.

Board notes 5 details

Layout: A tiered blue droplet-block crown and two striped balls sit above a broad orange-red star-crate frame standing on three legs around cyan vertical panels.
Goal: Drop the blue crown, open the star-crate frame through the center, and remove the last right-hand post and cyan base piece.
Opening: Shave the upper-left blue cap into the middle row, then break the lower-right cluster beside the striped ball before touching the orange beam.
Danger Zone: Do not chase the striped balls or blue cubes while they roll; the tall orange-red post on the far right needs the late shots.
Mechanics: A crown-first collapse exposes a three-legged crate shell that must be cleared from the center outward before a right-post cleanup.

Why is the lower frame still standing after the blue crown falls?
The orange horizontal beam still links three separate legs; break that beam, then the narrow center leg between the cyan panels.
What should I break first?
Start with the left and center blue droplet blocks in the tiered crown.
What is the final stubborn target?
The tall orange-red post on the far right and its nearby cyan base piece survive the longest; clearing them leaves 4 of the starting 29 balls.