Minimum recquirements
Make sure that each interactive element has at least a 48px* hit area. Leave a gap of 12 px* between the interactive elements to limit accidental tap. *Those reference sizes are for tools like Figma or Photoshop working @1x. It means that the frame/artboard size is at 640 x 360 pixels, not points. Multiple these values by 2 or 3 if you are working @2x (@720px) or @3x (@1080px). Finally, make sure to find the right equivalent when integrating as engines and tools within engines may have units that differ.