I used Google's vision tasks (https://www.npmjs.com/package/@mediapipe/tasks-vision) to detect the position of your index finger and feed the finger coordinates to SplashCursor (https://www.reactbits.dev/animations/splash-cursor) instead of mouse position to create a mini magic experiment.The finger detection is set to up to 3 fingers so it's technically a multiplayer.
My mobile could not handle the SplashCursor computationally so I've just defaulted to canvas/painting experience for mobiles.