I'll give you the ideas you asked for: 1) Get the catalog working, really. 2) If you can, create a multiplayer mode. 3) Get the login/register system working. PS: Ideas 2 and 3 can be done using just Firebase and GitHub. If that's not possible, I'll give you two more: 1) More games, get nicknames to appear, and then I'll tell you how. 2) Create a basic login system (without using a database) using LocalStorage.