First of all, I have never used Unity or developed games with Unity. This time, I used Codex+GPT-5.5+agent-sprite-forge to complete a Vampire Survivors type 2D summoned beast game made in Unity through dialogue. It took about 12 hours, and the most time-consuming part this time was the art materials. I used a 2x3 6 frames sprite sheet to create characters, monsters, summoned beasts, and special effects, making the animation look smoother. In addition, I had OCD and spent a lot of time redrawing it. The game content includes a playable protagonist who can summon 6 different summoning beasts. Summoning beasts will automatically attack and can upgrade and evolve; Enemies and bosses will continue to come from all directions, and the game has also added XP, coins, blood boosting items, upgrade rewards, and the option to summon beasts at the beginning HUD、 Scoring system, as well as victory conditions and defeat visuals. I encountered some practical development issues in the middle, such as sprite size alignment, animation orientation, HUD layout, blood bar updates, monster generation, and performance adjustments. I asked Codex to help me solve all of these, and this time the entire process was done manually. I think the most impressive thing is that AI+agent privilege forge is no longer just helping me create graphics or write code, but rather like a development collaborator and art partner who can work together to adjust games. The whole process was about playing, pointing out problems, fixing them, and finally helping me, someone who had never used Unity before (I installed it because I needed to test it this time), create a complete game that can be opened, edited, and played in Unity. In the past few days, it seems like I'm really turning into someone who can develop a small game with my mouth every day. The game link can be found in the comments, and I find it quite enjoyable