This is my first itch.io jam.
Since I subscribe to Codex for AI-related tools, almost everything in this game was created using Codex.
Code: The code was generated by Codex GPT-5.5. I have not looked at the code at all, except for the code related to music generation, which I mention below.
Visual assets: The visual assets were created using Python code generated by Codex.
Music and sound effects: I had Google AI Studio’s Gemini analyze gameplay footage of my own game and generate prompts for Codex. Based on those prompts, I then had Codex generate Python scripts to create the music and sound effects.
Localization: I created the game in Japanese. The English translation was handled by Codex.
Game engine: Unity 6. I have not looked at the code myself, but I did edit the values in the ScriptableObject settings.