Some of these, at least, aren't your scenarios. The Piano and Asteroids are classic Greenfoot examples that have been around for a long time, and it doesn't appear that you've even enhanced them other than adding the startup splash thing. That's a bit rich especially since your site says "If you use them publically you must give credit to this website" - you want to have credit given to you, but you don't give it yourself.
I have Given credit to the games that i have uploaded from the book-scenarios