Notes:
To access the Secret Levels, wait before Level 11 for 30 seconds, then shoot the blue puffle that appears.
To access the Expert Secret Levels, wait before Level 31 for 30 seconds, then shoot the blue puffle that appears.
Reskin of Astro Barrier (a164a103-026e-25c7-a0a7-2ce48a939987), inspired by Thin Ice (09b1a0a3-db9a-4ab6-b1dd-acd88cf8e823).