A growing series of tutorials from macbury.ninja.
Phaser js is awesome HTML5 game engine for webrowsers
"The whole game will be mountable Rails Engine. Thanks to this I will be able to add it to the header of my blog instead dynamic pattern. For graphics I will use free kenney platformer assets."
"In game you will be able to move through map, jump, place bombs and chat with other people. Bombs can hurt other players and monsters. The multiplayer server will be written using eventmachine and websocket for communication."