Use WASD or ARROW KEYS. If the maze looks weird press space. I suggest you to not go below size 10. V to hide the variable and B to show it. Still has some bugs.
Thank you @griffpatch for the tutorial. Song from Metro Boomin: Am I Dreaming This was based on when I always did mazes with my friend. I remember it so vividly and I hope you get to have the same experience!