Sorry, I have a question. First of all, is there a theme? And does the game have to be a magic game, but developed during that period? Thanks in advance.

the theme is only the animated assets we use 

^ these were all of the past themes

Game doesn't have to be a "magic game"

You can revive old projects. The goal of Alchemy Jam is to make something new during the jam period (not just resubmitting a project you previously finished)