A lot of fun! Swinging from rope to rope, is definitely the most exciting part, and just goes to show that grappling hooks do make every game better.
I really like the dynamic of building your own level combined with the Foddian gameplay; you can make the section more challenging by building less platforms in order to save silk, making your inevitable fall even more disastrous, but being able to catch yourself with a well timed web shot keeps you engaged while falling. I ended up using only single tile platforms on my playthrough, but I had so much silk to spare, that I never felt rewarding for doing so.
Swinging and climbing feel really great, but I wish the player's side to side movement was a little bit tighter, especially when just the tiniest bit of movement can spell a long fall down!
Something I would really like to see in the game would be more ways to use silk; even something simple, like assigning points for using less, combined with a speedrun timer, would add a lot of replay ability to the game!
Overall really fun and really nice job!