I've never had to think so hard about breathing. I like the atmosphere and mechanics. Was kinda able to mash spacebar to break it, but was hard to keep rhythm and was engaging. 

Great atmosphere and concept. Rough performance when looking at the trees, but when looking at the sky it was fun to play with how the breathing mechanic worked. Would rate this as a 5/7

It's an interesting concept. I struggled to figure out the breathing mechanic at first but I got there in the end. I had a very low frame rate which made it difficult to keep it consistent.