Hey Daniel!
I apologize for the trouble.
Although we most certainly did not add Hall of the Mountain King to the game. Is it possible that youtube added this music in order to replace a horror song we have in the game?
Other than that, thank you so much for the concrete feedback! We will make sure to try and keep the gameplay polished so that players do not get lost, but we are SUPER glad to hear that you did not have any issues playing the game!
Thank you again, this is a huge motivator to keep making the game!
- Milos from PackDev