This game is absolutely wonderful, I love the platforming so much. I can tell you guys put in a lot of work to make the controls feel really good. Once I got them down, I was flying through the map.
I think if you wanted to scale the game in a less linear fashion, you could maybe have horizontal sections that require more swinging; Perhaps introducing new monsters that can't climb, but are exceedingly fast on the ground.
Managed to do insanity first try, failed on kiln at the bottom of the 2nd chamber. Will have to try it again later, though.