I was watching the run to see how a 100% run could be improved/how the game runs mechanically, and was unable to hear any sound. Is there a way to edit the video with that?

Unfortunately when I recorded the run in the first place I had my OBS muted, both the microphone and the desktop audio, I don't think audio matters a lot in the matter of improving the run, since it's just a matter of how fast you can do the puzzles and skip the dialogs, I suggest however if you go for any world records to record with audio as the video can be sped up and runs without audio will be treated with a higher level of suspicion. Have a great one!

(also my run is very improvable, that was my first run on the game and I did it so I can submit the game to the website, it's definitely improvable just by practicing the game and puzzles a little!)