At first - just a HUGE thank you for such a detailed feedback. All messages and typos will be corrected. And I'm incredibly impressed that you found Easter eggs. Seriously, I'm REALLY impressed)
I'm not very good at creating gameplay, but I'm trying to tell a good story. That's why not so many puzzles. And I have very very little experience in gamedev.
About commands like "USE BLUE". As I remember from English lessons, "blue" is the adjective, and can't be used as noun. Maybe I'm wrong, will check it.
Station team is six people, seventh key is belong to the guest. The guest just is not on the photo, because no guest is not an employee.
About the diary. Another huge thanks, missed the "cycle" section in docs and got lot of pain implementing the diary.
Jams are fun, when you have time to make and play =) Really, huge thanks for every tip. Will work hard tomorrow to improve everything.