"When you work with HTML5 mobile games, one of the biggest headaches comes when the game runs well on YOUR phone, and you realize it won’t look as good when loaded on any other device.
On the web there are lots of tips and suggestions about scaling your HTML5 games to make them look good on any device, but I am afraid they all are too much generic.
The secret about scaling a game is: there isn’t a best way to scale an HTML5 game. You have to scale each game in a different way according to game genre.
This quick tip covers endless runner games, mostly built to be played on landscape orientation."