I’m glad to hear you enjoyed it! I can assure you that only a very small number of things in this game were made up. Trust nobody, not even random touhou fanfics on the internet!
144 FPS won’t happen since there’s no reasonable way to make a 144 FPS replay functional on a 60 FPS screen or vice versa. Though if you make your own DMK projects you can change the internal frame rate to whatever you like :)