Thanks for playing, you are correct the retry and restart options do not resend the difficulty... sorry I missed this.
regarding the theme, there are three parts that follow the theme:
1. Less artwork and game development -> more gameplay and more fun... ok that one is a bit of a stretch
2. As the decription says: LESS time you stay in the room the MORE chance you have of living.
3. The third needs to be discovered and don't want to ruin it for others
Again thanks for playing