Thank you so much for the feedback, Meru! As always, it's great to get your comments.
Regarding the scene where the protagonist opens the door, I had intended to add more animation in the background, even showing the protagonist’s hand shaking while holding the doorknob. However, time was a bit tight, so I decided to go for a more static impact, adding just the subtle animation of the darkness dissipating to reveal the body.
And yes! You understood the mushroom scene perfectly. It was an implicit representation of the protagonist’s failed attempts until he finally finds the cure.
It’s a shame that the audio issue occurred during export. It was working perfectly on my end, but it seems like it only played through the right channel for you. I really need to figure out what caused that bug, especially since I remember you mentioned something similar happened in my game Gastronoir as well (I actually tried a fix in that one because of your previous comment, but unfortunately, it seems it didn’t work).
I'm really glad you enjoyed the story. A fun but almost imperceptible detail is that the duration of the butterfly scene crossing the screen is exactly 5 seconds, and the animation of its wings flapping completes 5 cycles before it disappears completely.