Thank you so much!
At first the serve/refill & attack were separated buttons, but we changed the enemy to be more streamline then ended up changing to left click for everything.
Then we did some testing to see if people like space or left click more, and they were roughly the same amount. You can actually use either left click or space bar on anything. We just thought the tutorial look more organized when serve and refill are on different input since one of them requires tap and another is hold. Sorry for the confusion😅