I've recently found some HTML5 stores where either users can buy your software or publishers license it: marketJS and Clay.io (not to mention Chrome WebStore).
My question is: Are there any more known sites where I can upload my game for sell (talking about PC platform)?
Develop games in your browser. Powerful, performant & highly capable.
I recently added my portfolio of HTML5 games to internet giant AOL's major gaming platform, Games.com
I don't know if you can upload your game for direct sale, but it's the largest site I know that has adopted HTML5 content.