So it can be run on the web? Nowadays, you have to have a premium account to do that with dropbox. There are alternatives though. I'm using altervista right now.
You can export as an html5 project, zip the project, and use their archive uploader to upload the zip. It'll automatically unpack. Then you just link to the index.html file.
Others have suggested alternative sites. One I've been meaning to look into is:
They let you host your files for free, and link out to them. I haven't used them for that yet though. Just a really awesome site in general; a lot of thoughtful, offbeat indie content on there.