OH... I get it now. You'd try aiming, it wouldn't open targeting because you were empty, then you'd move when you didn't mean to. That's definitely I got from playing DRL because it works the same way there. Jupiter Hell Classic just adds a "hint" message at the top of the screen as an extra reminder. It didn't click until I had a friend playing and he said it out loud
I did push a v1.0.2 that adds auto-aiming at the closest enemy. Trying to keep a limit on what I do post jam period to be bugs or major QoL updates that are real annoyances