Poly Runner VR

Long before Race The Sun got its VR mode, this game came out. In fact it was one of the earliest VR games to release on Steam. It's basically a third person endless runner, where you weave around obstacles as your ship speeds on and on. Since the controls are simple (only left and right), it offers three options to control the ship - gamepad, head turn, or head movement. You can't use the motion controllers, I guess because it was developed for mobile and before the Vive announced its motion controllers. Personally I think the head controls are okay with this specific game, they make sense. And surprisingly, there's no motion sickness at all, despite the high speed and third person camera. Even for first time VR users, it plays comfortably. There are a few negatives: no motion controller support, and the levels are arranged in a strange order - it starts out difficult and then gets easier. Also each level has a colour scheme, but some of them are too monochromatic to offer proper depth perception. I definitely recommend this game, give it a go and demo it to your friends.

It's Race the Sun, without the racing the sun part, or any of the powerups, in VR. It's not the structures I mind, it's when the ground is uneven and that hill is low enough for you to go over, but that other one that is just barely higher is too high, so you crash. Still, it's free, and controls decently, so try it out.