Allow downloading source code
Sometimes it'd be helpful to easily download the source code of a dotnetfiddle paste, either a single file or the whole paste (e.g. all files from a MVC "project")
Download with project file csproj would be much better. You can also create a multi-file GitHub gist out of it for GitHub linked accounts (like https://www.sassmeister.com/ does)
James Ko commented
THIS, or at least allow us to push it to GitHub or something. It would make my life a lot, lot easier.