oh no! I am using Input.GetAxis('Horizontal') which takes input from WASD and arrow keys, or that's what I thought. I'll test more. Maybe the build settings somehow causes an issue. Thank you letting me know!
Thank you! I was thinking what could be the issue and then someone else mentioned it to me: did you try pressing space? I limited the first few movements for story purposes. I'll improve the UI and make some additions to the description soon. Sorry about this!