Dev Builds Daggerfall-Style Game Codexfall with Astra

Episode 1 · Dev Uses Astra Agent's Fast Feedback Loop to Polish AI-Generated Game (2026-09-06, 2 posts)

Dimillian reports spending 90% of his time collaborating with Google's Astra agent, using a play-and-fix feedback loop to iterate on fast travel, combat and first-person controls.

• Dev uses Astra agent to refine game combat while live-playing in a quick feedback loop — Dimillian · 2026-09-06
• Follow-up: dev iterates on AI-generated game, polishing fast travel and combat feel — Dimillian · 2026-09-06

Episode 2 · Developer Dimillian Builds Daggerfall-Inspired Codexfall with AI Coding Agent Astra (2026-09-06, 5 posts)

Developer Dimillian showcased using the AI coding tool Astra to take a Daggerfall-inspired procedurally generated game, Codexfall, from nothing to playable, as a test of whether an AI agent can end-to-end generate a complete game world. The game is playable directly in the browser, making it a tangible case study of how well current AI agents can handle large-scale project construction.

Confirmed

• Development process: Dimillian first had Astra list all the systems needed to run the game, then asked it to write them into a roadmap document for tracking progress, and finally had it build the first vertical slice containing the foundations of all systems in ultra mode.
• Game content: Codexfall is a large procedurally generated world with many systems, featuring numerous towns, dungeons, combat, conversational NPCs, and magic and guild systems — a first-person dungeon crawler themed around steel, magic, and exploring ruins.
• End-to-end generation: The game's trailer was made entirely by Astra itself, including the soundtrack; entering any seed on the new game screen generates a brand-new game world.
• Iteration approach: Dimillian iterated continuously by playing the game, focusing on polishing fast travel, combat feel, and the first-person perspective.

Why it matters

• The project shows that AI agents can do more than write code — covering system planning (the roadmap document), music, promotional video, and seed-based procedural content generation — making it a fairly complete stress test of an agent's end-to-end development capabilities.

• Codexfall: dev builds Daggerfall-style procedural world with Astra — Dimillian · 2026-09-06
• Codexfall: Daggerfall-inspired game built with Astra, towns, dungeons, guilds included — Dimillian · 2026-09-06
• Dev uses Astra on ultra to blueprint systems and build a game's first vertical slice — Dimillian · 2026-09-06
• Dev iterates Codex-built first-person dungeon crawler Codexfall, playable in browser — Dimillian · 2026-09-06
• Astra made its own game trailer including music, generates worlds from seeds — Dimillian · 2026-09-06