OH WOW! I love the idea of the higher layers would get brighter and nicer! I think I'm going to add that in on our next build of the game!
The climbing was one of our rough spots to try to get working the way we intended. In other replys I've talked about our first version of the mechanic and how touchy it was. We almost didn't think we were going to be able to pull if off. I see that I may have needed to come up with a more clear version of the instructions on how to use the hearts to create permanent hand holds. And boy I wish we were able to get the grabbing of the ledges to work too. My wife is the coder of our family and I had almost started sounding like a broken parrot asking about that.
Don't know how many times I tried grabbing at the ledges when falling or try to pull my self up.