Thanks for honest opinion on the music! I have little knowledge about the music theory, and I knew I have a lot to learn as a newbie of music making, and it's my first time trying to make some noise more than ten seconds.
Firstly, I have completely no idea for the music, I just want something can make player feel dangrous, then the classic zelda dungeon came into my mind, so I searched the video and copied its chords. That change into major at the end is for making player knew it's close to success, I knew it could a little abrupt. For the door, I just want to make it look like a dungeon, and I originally planned to make a cutscene that the player entered the room and the door closed, which I have no time for. The confusion it creats is unexpected for me.
Anyway, thanks for playing!