There has been no recent downtime. If you're having an issue playing something it's probably related to that game specifically. If you could share which game you're having an issue with I can take a look.
Thanks
It sounds like you've packaged the game wrong. I found this tutorial here that might be helpful: http://wiki.compilgames.net/doku.php/gdevelop5/publishing/html5_game_in_a_local_folder
Edit: I see you're using a 7zip file (7z). You must use zip (.zip), no other archive format is supported right now. Thanks