Thank you so much for playing! We're super happy to hear you enjoyed the prequel as well :D
And, as Royal Alchemist is an indirect prequel, there will be a number of plot points that you will be able to connect if you've played it. Although Royal Order is supposed to be playable standalone, there certainly are events that are intertwined. That said, Royal Alchemist's main cast is not planned to appear directly in Royal Order. (But you may spot a lot of references to them.)