Thank you so much for the detailed feedback!
Regarding the difficulty, I’m wondering whether you used the tools purchased in the shop. You can switch between them with Tab, and they make the quick-time events considerably easier. If you did use them and the game still felt too difficult, then I understand—the timing may still be too demanding for some players. I’ll keep the idea of an easier mode in mind.
The transparency difference between areas is intentional. Near the body, the character is shown as a ghost for narrative reasons. In the area where you collect lifetime, I made the character fully visible so that playing as a semi-transparent character for most of the game would not become visually distracting.
I completely agree about the sound. Other players have also mentioned that the game could use more sound and visual effects, and making the music more intense during the quick-time events would be a good improvement.
Thanks again for playing and for taking the time to write such a thoughtful comment!