yeah, I'll definitely be fixing that issue and adding more levels.
As for VR, it wasn't planned, I forgot to turn off VR in project settings but it's weird that Steam launched VR since Steam Integration was disabled.
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That's great to hear that you are planning to add more levels!
Regarding the SteamVR problem, I have SteamVR installed on my system, which might help to better understand the issue.
I think it's possible that it activated when the game requested the HMD, as similar occurrences have happened to me in various VR games as well.