I voted Best With Friends, but not GOTY. The game isn't out of Early Access. I will consider Valheim for GOTY when it's out of Early Access, and how much of their original road map was implemented.

For example, I was an early adopter of Cubeworld, years before it was released on Steam. Look how that turned out? Totally different from what it was promised. So while I do like Valheim immensely, it doesn't deserve the GOTY badge just yet.