like most other fanmade pyramixed mods, the ambience cannot be stopped when you enter horror mode (you must disable it first in normal mode)
also, thank you for adding old simon sounds, i really love it over the original, it syncs much better with mr. sun and overall, the horror melody in general.
however, it sounds like the old simon sounds are a bit out of place as if it has been recorded with a mobile phone or something, i can't really explain the issue, hopefully this can be fixed by just using the soundfiles that are available online rather than recording it yourself, as it's redundant.
no offense though, i am still grateful the old simon sounds are added and now this is probably my favorite fanmade pyramixed mod as it contains everything that i wanted, old simon sounds, mr fun computer with lyrics (you wouldn't believe how many still do not have it, such as the "original" pyramixed without animations old versions of pyramixed 0.9 etc..) and the "lost" characters that pyramix was planning to add
oh yeah and this is also the first pyramixed mod i've seen with animus animations. Awesome! I hope you can add Penz in some update. The fact that this one still gets updated unlike most other ones (especially the only "popular" one on cocrea...). Funnily enough, the popular pyramix on cocrea right now is "remixed". No idea what the hell this means exactly, however I noticed that it lacks quite a lot content unlike this one.
One last critique, i'm not a fan of the slide menu you added at the left (with the arrow). hopefully you can make this toggleable or remove it as it's quite redundant, since you can see the options in the gear icon menu anyway.