Codea is a beautiful code editor with games in mind.

To get Codea projects into Working Copy, you export them as zip files. Tap and hold the project to Export. You need to Export Zipped Project and pick Open With… and if Save in Working Copy is missing it is enabled it by tapping More at the right.

When saving Zip files into Working Copy you can import as new Repository, which makes sense the first time. Later on you want to save the contents of the Zip file into the existing directory, to overwrite any files that have changed in Codea.

To get projects from Git into Codea, you use the share sheet from a repository or directory in Working Copy. Pick Copy as Codea Project to create a project with files in the clipboard.

Inside Codea you tap and hold the big + to create a project from the clipboard.