Here is another tiny robot that can teach you a thing or two about technology and programming. The Kitronik :MOVE mini kit consists of a 2 wheeled robot with autonomous functions. It can be controlled using your Bluetooth smartphone or a second micro:bit as a controller.
You can program this robot to draw shapes by moving a pen or follow a line. It has 5 x RGB individually addressable LEDs too. :MOVE mini plays well with MakeCode. You can find out more about it here.