I've found a method for how you can replay the same level over and over again (also removing dialog in level 1, etc)

Is there an interest for a guide on how to do this? I guess maybe the game is short enough that it doesn't need the ability to practice specific levels.

Add whatever guide you want. I have no problem with people adding guides, especially if they're mods.

First off, your English is fine. Secondly, yes you can. Go to Program Files (x86)\Steam\steamapps\common\Escape the Game\SFX\Music or something like that and you will find the music folder. Hope that helps.

@Kochie87 I have a music guide in >Guides :)