v1.1 is up now, fixes 3 of your mentioned points.
I wasn't able to reproduce the music issue, can you explain a bit more detailed what went wrong?
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
Very well, piece for piece the bumps are ironed out. :)
In 1.2 the music can be deactivated by chosing the value 0 but the other values don't affect the music in the game - in other words: there is no difference in volume between the values 1 and 9 for the music in the game (not the menu music). The correct volume gets enabled only if I interact with a closed password protected door: After I do that the music plays with the volume that has been chosen in the settings - but as soon as I get into the menu and return to the game it's reset and plays loud again.