Hi, has mentioned by Noahnoha55, you cannot submit a tool already published on itch before the jam starts. I encourage you to work on something new or something that has not been published on itch yet.
If you really want to works on your enemy-generator, please publish it as a new entry and with a different name like “Enemy Generator 2”, “The New Enemy Generator”, “Very Evil Enemy Generator Deluxe Edition” or something.