How long is this game? TY

I dont know if this uses the source from the portal games or half life, it doesnt say anywhere

Looking at their steam developer page, it looks like they mostly make short games that they give away for free... I would love to see them work on an actual full length project, was really impressed by this little gem.

So, every time I try to boot this game it starts up SteamVR, which then redirects all the sound to my Index. From what I understand this happens if you leave the steamvr / openvr plugin and/or the oculus plugin enabled in Unreal Engine when you compile the game. (They're enabled by default) If the devs read this board, is there any way that you can disable these and push an update?...

：(