Mate your game is great! Genuinely scary and great use of sound design! And I found our cartridge immediately by chance, super sweet thank you!
You have a keen eye! If you want I can send you that asset to keep for yourself, just let me know where to send it to. Also I won't make you get the full completion to unlock it so type "day" in the main menu or extras menu, try the GB Bonus Scene ;)
Edit: Download the latest version! I can't believe I didn't find some bugs that were there.