Today we had a couple of updates to the app and language packs, including a fix of debug rendering flickering, as well as new custom rendering feature:
PlacedText. API Section of the rules has been updated accordingly.
Also some fixes have been applied to the testing system, so it should be little more happy with your submissions.
Remember, if you upload a zip, you need to structure it same way as initial client code — submit all files, with root of the zip containing project files (root should not contain a directory with all the files, but all the files directly).
Have a good weekend!