thanks for your comment;)
Yes your right a hacking protection would be recommend. I also have thought about it before I published the game but hacking it is not worth so much haha. Furthermore I am working on an update with new stuff so I could try to remove the security leaks. And about your question of making a tutorial level.. If you click on a hotel the first time a dialog window opens which shows you want you have to do and you can always click on the info button ( I ) on the top left corner^^ And my English is also not perfect because I am German but I prefer making games in English.
So yeah thank you so much and have a nice day:)