Thank you for your feedback. Mobile friendliness has been enabled since the time of publication. Since this game is HTML, I don't think there will be much change.
For anyone else who has this issue - running in Firefox lets the game run in portrait mode. There may be other browsers that work but chrome and Brave are not among them
I see, so that's the background to your comment. I was testing with Firefox and Edge, so I didn't notice that. However, can't you switch to portrait mode from full-screen mode in the lower right corner in other browsers as well?
