There is an "available to play online" icon in global listings, but not on the creator profiles. And I agree that an icon to indicate e-books, music or assets for download would be nice too.
Ah, good to know. That "Play in browser"-button would work. The world symbol from the "Web" filter is a tad too generic, in my eyes. It's likely a good idea to unify the appearance of the games in the globals listings and the creator profiles.