2-1 PRELUDE PEAK 1:32.2 (somnabuster developer times)
The first room for this stage is really funny. With proper timing, you can Broomshred through the whole thing without skipping a beat. But, even if you did, there's actually a faster shortcut by just ceiling jumping up from your starting point. This video contains neither of those because I'm a fraud.
This level, conceptually, was really important to me - I really wanted it to sell the feeling of exploding into the rest of the world. Seeing the rolling clouds from the precipice of the mountain and then flying into the sky; briefly touching base with an airship going separate ways; platforming sections that weave between outdoors and caves; a very subtle transition from day to sunset to night...
It surprisingly didn't take a lot of time to make despite how many unique assets it has.