I know it sounds cliche, but having been playing games for 25 years, this is easily the most stunning and most heartwrenching of anything I've ever seen.
I was sceptical about how good it would be with a companion, but having gone from start to finish with the same person, I can't imagine it being as good by oneself. It truely made me care about doing whatever it took to not lose my fellow traveler. When we got seperated a couple times it was nervewracking because I had to know that they were ok and would search frantically for my other half.
Thatgamecompany has really outdone themselves with this priceless gem.
"Nothing finishes off a Hard run like a tall glass of freshly Filtered Water." - BakusaiTenketsu