Great, I'll give it a try. :)
The music thing: If I lower the music volume in the settings, it only lowers the volume of the music played in the main menu. The music in the game itself isn't affected by the settings.
edit: rather strange: I set music to 0, go back to the game but the music still runs. Then I interact with a door and the music stops (the game sets it correctly to the value 0 I guess). But as soon as I hit ESC to get into the menu and return to the game, the music is on again.
Another small thing: If the game starts and I hit ESC during the Brocanty-logo the game crashes.
The movement is a bit faster now and it feels much better. It's still slower than on the TI-84 though. For comparison: https://www.youtube.com/watch?v=5UHqPMxeZnY&t=198s