Just in case you missed our previous post about what is melonJS, you can go here.
Now you already know about what melonJS is, and probably are excited and want to start making your game right away, here are some tips that might help you out :
1- Go to melonJS Wiki
This is melonJS centralized knowledge base. You will find lots of information here, from Documentation, FAQ, Tutorials, and more. We strongly suggest that you read FAQ section and play some of games created by melonJS in section.
2- Complete Platformer Tutorial
3- Complete Space Invaders Tutorial