Room Transitions!

One day I wanted a way to slide rooms to the next, ya'know, like in the original Legend of Zelda, or in Celeste? Turns out it wasn't as easy as I thought, but I managed to get it done regardless, and I am satisfied with the result and how I programmed it in. I am definitely saving this project because I will very likely need to use this for another project.

Feel free to ask questions in the comments.