I don't want to make any definitive statements, but this website is safe to use. Many servers use it, and I'm sure we would have heard something by now if a vulnerability was exploited/found.
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My summer vacation is coming up, and I'm considering restarting feature development. If you have any (reasonable) feature requests, post here! Something that I already intend to do is to have a better download page manager (more links, custom images, etc), and maybe even a plugin system.
EDIT: 5/8/2014 UPDATE:
- Added debugging mode for administrators. Suppose you're modifying the PHP files, and you accidentally break something. This error will show up, which will allow you to directly modify the server files.
You may be thinking that this is pretty unsecure, because users can edit files. That's why users who are
not admins will only see this:
In the future, I will be adding a maintenance mode which will allow administrators to temporarily take their site "offline" and show an offline message/page.