Great demo, I am keen to see the full version.
Sadly i think you kinda killed it with the last climb...birds! Don't get that at all, they do nothing but cause frustration and kill the experience in my mind. No real need for them. Either get rid of them or maybe give some tips on how to get past them if not.
View can be a little difficult to deal with at times but other than that everything seems well made and works well.
Side note, possible glitch with left hand not holding properly (windows version), i constantly fall due to it letting go for no reason. Never happens with the right hand so it makes me wonder if it's a bug, just seems odd so i thought i would mention it.
Nice job, good luck with future development.