This is a very basic Phaser game example. If you want to learn phaser game development, you can try from simple things like this.
There is a cat, initially it is happy. But there is an indicator that decreases time by time.
By clicking the cat’s face, the indicator increases accordingly.
If the indicator is full, the cat is happy. And if it’s empty, the cat will cry.
Try to watch it in this video:
The face change of this cat faces is handled by Phaser in a simple way. You can review and take a look at the source code here: https://github.com/habibieamrullah/HappyCat/