> Also I believe the audio is reversed at 13:35-ish for a short time
It's just a part of his speech. "Japanese forces still appear to be attacking at many points".
Also, the track title reads "xray_broadcast_1". I'd expect more to come. By the way, the spectrogram doesn't appear to have anything hidden.
This isn't exactly a LP, but I talked about Oxenfree on my radio show/podcast, and it got...personal (we begin talking about Oxenfree about 10:45 in): https://www.mixcloud.com/TwoTotalNerds/two-total-nerds-episode-11-part-2-best-video-games-of-2016/
I noticed it too, and I downloaded Morse Tools on android, but even though I got it to distinguish some letters the message was not clear to me. You can try if you want.