Found a bug. When Homework Demon is summoned, the opponent can't see their Demon Homework in hand, but they still can't play anything without "Homework" in the name. Also, you can right click your opponent's cards and see what they are.
Thank you for the notice! We noticed those too and are going to fix it when we have time. We're still developing the game and have a list of features we want to add and bugs to fix. We don't have as much time since we are still in school, but will definitely release an updated version when it is ready!