I enjoyed it a lot, though I spent a embarrassingly long time retracing each room looking for what i missed. The thing where each hole went somewhere different took a while to figure out, and i found where to use the lockpick by accident.
I hope that's vague enough to be a hint but not a spoiler...
If I were to put forward a couple minor suggestions, I'd use a boxier surveillance cameras and florescent light fixtures from the 70s or 80s to go with the outdated feel.
Thanks for the great game, being part of the demo disc (can't wait for a new one!)