Very fun! The art was very cute, reminded me of Gunter from Adventure Time. This was a very smooth platformer! Everything was super responsive. Swinging around was hard to get the hang of at first, but very fun afterwards to do my best Spider Man impersonation. I especially liked when I realized that I could use my momentum to go in almost a full circle to get on top of the block I was attached to. Having that ability almost gave the game two modes: easy mode was doing the loop and landing on each block before proceeding, and hard mode was going block to block without landing.
I unfortunately did clip through the walls once when I got to the top, and wished there was a way to restart from my last checkpoint without dying, because I was unable to find any water on my side of the iron bar :*( The only real issue I found though was with it being a web build while in full screen mode. When I would try to click on platforms near the top of the screen, the browser would assume I was trying to exit full screen and would drop down that big X button, which would take my mouse out of the game just long enough that I would miss the platform and fall.
But other than those two little things, I had a ton of fun playing this game! I wasn't able to make it to the final checkpoint, because that last level (maybe last level?) with the iron death walls was diabolical! Really great job with this game!