4-1 GAUDIUM GARDEN 1:59.6 (somnabuster developer times)
8I actually feel pretty middling about how World 4 turned out - there were some level mechanics I couldn't pull off due to time limitations, specifically in 4-2 and 4-3, but that's for another video.
4-1 is one of my favorite levels despite that, not just artistically but in the bounciness of different movement styles you get to do here. I took after a bunch of aesthetic influences for this level - Mario Party for the music, Amiga mascot platformers for the outdoor sections, and Castle of Illusion for the brief indoor section. There was actually 1 more indoor room where you'd collect more ducks, but it was a pretty bad pace-breaker, so I removed it. The room's still in the code, there's just no door to take you there. If someone figured out my super-secret-devcheat for level selection, THEORETICALLY, you could visit it... and experience my disappointment.