You have to use arrow keys to proceed.
I was using my mouse to play the whole game so I was also trying to progress that part of the game using my mouse the only thing I used until then and didn’t know you could use arrow keys to move too. Randomly found out that I was supposed to use arrow keys to move. After you finish that part you’ll realize what probably causes the game to only work with arrow keys.
Well since I’m 3 days late I also have to assume you already got past that part.