Restart your PC and try again (it’s always worth a try!)
Verify that the game downloaded correctly. Right-click on the game in your Steam library, select Properties->Local Files, and select “Verify integrity of game cache”.
Check that your drivers are up-to-date. You can find instructions on that here: https://support.steampowered.com/kb_article.php?ref=6416-EYDH-0477
If all of that fails, please send us a mail, and include the following files:
The game’s log. Find this by following this path:
C:>Users>[User Name]>AppData>LocalLow>Fireproof Games>The Room VR Your DxDiag report file. Press the Windows and R keys, and in the “Run” dialogue that opens, type “DxDiag”. Press the “Save all information” button and send us the resulting file.