This has a good foundation for a really interesting game, emphasis on foundation! I really like the idea presented here with working for a company and finding out the other people there aren't all they seem. In the video I do rant a little about it, but there's an item which can be made but really has no unique use and I think even a bug given how it affects a certain puzzle and makes the game incredibly short (can maybe do it in 2 mins or less with that knowledge).
I think if this was built upon, made to be longer (30 minutes or so) with a much slower buildup. Maybe the menial tasks you do as an "intern" start off normal, then things slowly start to seem weird, or certain requests are made that most people would find unusual. When things begin to kick off and the alarms blare, it would be good to get some reaction from the other people in the facility (or lack there of). We meet who I thought would be a reoccurring character at the very start who disappears after 2 tasks are done, I wanted to see what their reaction would be for example.
I know this wasn't made with a long story in mind, but I would honestly love to see this expanded upon as it sets a good base and I'm genuinely curious as to what's going on in this facility, and more about how the protagonist landed the job. I feel there can be tonnes of expansion here! Overall a fun, quick game which leaves me wanting more, in both good and bad senses.