How to fix oversized game

I recently made a game for my classmates. When I tested it in the create/code menu, it worked fine. But when I published it, now it is so oversized. How do I fix this?

Here is a link for the game:

https://microstudio.dev/i/MrViolinistMan/monkeyeatbananasimulator2/

You can either set a fixed orientation and aspect ratio in the advanced settings or use screen.width and screen.height in your code.