I'm falling flat at the final step: packaging my game, written in Java SE 11, so others can run it... and unfortunately I am also out of time to fix it. (Technically I have 1 hour tomorrow morning - after that I go to work and an evening event, forbidding any further work - but... the way things are going, it's highly unlikely to be fixed then.) Sigh... making the game was still fun, though, despite being unable to submit.