Wonderful graphics and atmosphere.
x1015y1000 - wallswim if you go left and jump
x1016y997 - void if you climb up
x1011y1002 - wallswim if you climb up
x1009y1003 - void if you climb up (though here it's not easy)
A very nice level! Can't really add much to the praise others have already given; as for drawbacks, I thought the world was a bit empty - not much in the way of little plants here and there, harmless critters, etc.; just the essentials for the most part. Also, I've reached the underground ruins from the right side - I guess I was supposed to go back to the air ruins (sic!) after getting the umbrella? But I went straight to the right and ended up getting the sticky slime area first; which landed me into a screen where I actually enter a screen from the right, and the bird is running away right next to me.
Also, interesting music here. I don't think I've ever heard anything as.. post-rock-ish? :crazy: as this in any KS level before :)