WASD to move, E to grow in size and Q to shrink. These are basic actions that you should press during the lag to see how laggy exactly the game is If you hold down the mouse/hold down on the screen as the cat says 'Hello' it will skip the next few speech bubbles (it's for if you don't want to wait)
I was coding a different game and then guess what? I made the mistake of accidentally putting code in it that made the game lag very hard (I removed the code from it) and decided to test that code out in a new project. This project, in fact!