I used to serve game from the public dropbox folder, but now, i only can view the shared index.html file.
Was this feature disabled by dropbox?
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That feature was only available for the premium dropbox users, but was discontinued, because "insert dropbox logic".
But now a days, you can get a free webhosting a free domain and upload your files there and server them to people you want. Wix is a good place to start for free, there are other services as well, like freehosting , 000webhost (this might cause some security issues, but not big concerning), hostinger, etc.
<insert dropbox logic>