For the credits, you don't have to keep on printing the same things. Instead you can use a scroll function, and if you want it to stop at a certain point you can use a repeat until function.
I forgot, you need to have a wait in there. It should look like this. This will make it start at 15,15, and scroll down. To scroll up is 0,1. To scroll right should be 1,0, and left should be -1,0.
