Finished the first rank!
I was inspired to pick this up and work on it again by the Creator Commentary videos, since I wanted to be able to watch those without spoilers. Fortunately, it wasn't too hard to get myself unstuck. Some nice tricky levels and satisfying linchpins, especially towards the end of the rank.
I suspect a backroute on 1-31 Slipstream, so I've attached my replay.
1-36 Bloom and Doom was the hardest level for me in the rank, as there are lots of tempting blind alleys to follow.
Now that I've solved 1-37 Sanctum of Nippius, I'm not sure it needed to move that far. I solved it pretty quickly today, because I
knew I was on the right lines and I just had to spot one trick to make the route work, so I stared until it clicked
It has much lower entropy than many of the surrounding levels, because you can place most of the skills immediately. Also
its current position is very close to another level using the same trick, which makes it easier to spot that trick there.
If you were to consider moving it back down, you could swap it with 1-29 Bring in the Siege Engineer, which is much trickier than its current position.