Remarkable: The scope and completeness of the experience. With a limited amount of time and resources, you really created something that felt like its own world.
Needs Improvement: Like others have mentioned, the scale was a little strange. A small thing I found strange was that the music was quiet during the "jail" scene because the audio source is so far away (in fact, when you return from the jail that becomes clear because the volume goes way back up again). Finally, there were some "plosives" in some of the voice recordings, so for future projects it would be worth it to practice better mic technique or record in a recording studio (which we would be able to do if it weren't for COVID, so totally understandable that the audio isn't professional quality).
Successful: The use of audio is really great, and the way you introduced the Easter eggs, and the challenge in finding them, was both novel AND accessible. In other words, it was well balanced, even though each Easter egg was found in a slightly different way (some were spacial, some were interactive, some required you to do things that, as a player, you might not think to do).
General: Even though this could be "polished" more, I think it's really successful as a prototype.