Here is a free load screen maker:
http://heartcode.robertpataki.com/canvasloader/
This should be handy for all the html5 projects. I just don't know how to implemen it yet. If there's smarter people than me here I would like to hear your opinions.
It's really nice but it doesn't do loading bars it appears , only "infinite catch tail style". So you can't see the loading progress of the game.
fairly nice though
Develop games in your browser. Powerful, performant & highly capable.
It is interesting to customize the load, but can not get the bar longer charges indefinitely.
Sorry, you can't yet customise the loading screen in Construct 2 games, other than changing the logo.png image. It's on our todo list to improve this!