You'll also need a pair of Oculus Touch controllers if you're using the Rift, or a pair of HTC Vive controllers with the Vive, as the game is built entirely for the "room-scale" VR concept — which is to say that the game requires a powerful PC, a high-end virtual reality headset, motion controllers, and an open space to play it.
In case that isn't clear enough, we're talking about the deep end of VR here. To play this game, you're either one of these people who has a dedicated VR room or you're friends with someone who is. It's rad if you are that! If you're not, there's no other way to play "Rick & Morty: Virtual Rick-Ality" at the moment. And that's less rad.
(As a consolation prize, there is another "Rick & Morty" game — "Pocket Mortys" — available for smartphones. I hear it's pretty alright, in the style of "Pokémon" games, but I've not played it.)