"Up Next" scene at load? (Steam VR)

Hello!

I just finished my first VR game for the Vive. It was developed in Unity version 5.3.3f1 using SteamVR plugin v1.0.8. Usually when I run my build, my first scene fades in from black (very nice). However, after uploading to my Steam Depot, and downloading into my Steam library something very different happens - a bright scene appears (looks like Unity's default skybox). In the scene there's a cube and text that says "Up Next" and then my game starts shortly thereafter. I've not seen this happen in any other VR experiences on Steam and it feels out of place with my game style...

How can I remove or customize this scene? Is this something to be addressed in Unity, or is it a SteamWorks installation settings issue? Any guidance is appreciated! Thanks.