Writing a game can be a very fun task if you are using a framework like Phaser. I came across Phaser when I was looking for javascript libraries for game development. What I liked about Phaser is that is not just a physics engine, but has many features which make creating games using Javascript a breeze.
Checkout the live demo here https://ashishware.com/static/game.html
Another great discovery was KennyNL‘s website which has many game assets which have been released under CC0 1.0 Universal license by KenneyNL
The site includes hundreds of sprites, sounds and background images.
I also managed to create the game as a PWA (Progressive Web Application), which means that you can install it on most mobile devices:
Here is the link to project’s github page: https://github.com/code2k13/Jump2k21Game