This isn’t a layout. It still has a tiny amount of decoration. For example, he didn’t just use default block clumps. He made a custom background a little bit. He played around with air deco. He used the alpha trigger. It’s not a layout.
All the different types of gimmicks are implemented so well throughout the whole level, the gameplay and layout is fantastic. Thanks for showcasing this nexus, I wouldn’t know about this if you didn’t showcase it :)
I just relized that when you play a level and exit to the menu background and ground changes to the last levels bg and ground. i think there is no one that found this.