This is my project using Micro;bit. How the Micro;bit Works? 
So, at the beginning, the microbit will show an animated blinking heart, and emit a melody. After that, the microbit will show an expression like a sour face.
If you press button A, the microbit will show a suprised expression. If you press button B, the microbit will show a smiling expression. Then if pressed simultaneously the microbit will show a heart emoticon. And if press the Micro;bit logo, the Micro;bit will show a n expression like sticking out your tongue. if you shake the Micro;bit , the microbit will show a sad expression.