So far I've found the .chr files being genuine: two are images, one is an ogg vorbis sound file, one is base64 encoded story about murder for curiosity's sake.
And there are files appearing in the main directory and disappearing after some playthroughs.
Also, I recall a poem or two in base64 (from == at the end), but I didn't copy them by hand into a notepad to decode them. (EDIT: I later gutted the game files open and decompiled the code and got the poem from there, so yeah, it's something, I don't get what it refers to though).
Anyone found anything else?