Good work Tom!
I found two bugs:
First, on /addons/create, (without /make-games in the url, linked to via the bottom of the "Your Addons" page at /addons/manage) I can see checkmarks for "Official Addon" and "Built In Addon". I haven't actually tried submitting anything there but normal users probably shouldn't be able to access to those I think.
And another small visual bug: There is a visible text overflow in addon descriptions on very long lines. Seen at /make-games/addons/111/colyseus-multiplayer
Do you want to continue using this thread for future bug reports or should I use the Construct 3 issue tracker on Github?