I got a switch in fall 2017 from a friend who sold me his. It came with Breath of the Wild and a couple others, and even though I already had it for Wii U, that was the only thing I played for a while. So that would have to have been my favorite Switch game of 2017.
There are a couple others that I chose to purchase to download, like the classic PC game D/Generation and Oxenfree, which isn't a game so much as a ghost story, but fun to play through multiple times.
"They'll never do it in time!"
"The code! The code! Figure out the code!"
"It won't be easy!"
"Cut this out second, this fourth, this first, this third."