An amazing game!! Really enjoyed everything about it.
Sadly i couldn't finish it, it crashed D: I'll give you the details of what I did so you can look into it:
When I got the white cassette with the strange audio, I sent the two words: ||and between||, and green light turned on. Then, got the same cassette again but had to rewind it this time... when I realized it was the same audio as before, I immediately typed the same words, pressed enter, and the game froze there. Hope this helps.
I would really love to play a full game like this, it's super fun!!