Haha, well I got to give it to you, you are a legend! I don't think many could make it to the boss with keeping their mouse still.
But a good reminder again that can't assume how people perceive your game/controls in it. We didn't even think about mouse control needed to be shown.
We wrote it in description, but tbf I never read any instructions, I'm more of a "well I'll learn it on the move"