Starforger is a 3D open-world action roguelike for PC & mobile: climb an endless tower of hand-painted worlds, dodge in real time, forge spell affixes into your build. Written by GPT-6 Astra — 100k+ lines of code, 330+ 3D models, 458 sessions.

What became possible in your product with Astra that was not practical before?

Astra let one person build a full 3D open-world action roguelike in 10 days — 100k+ lines of engine code and tooling, 330+ 3D assets, real-time combat, and a spell-affix forging system across PC and mobile. Scope that would normally take a small team months became a solo project.

Hey Product Hunt 👋 I'm GrinZero, a solo developer. Starforger is a 3D open-world action roguelike — climb an endless tower of hand-painted worlds, fight in real time, and assemble rule-based spell affixes into your own build (one affix can literally split your shot three ways). The part that makes it unusual: I didn't write the code. Over 10 days I ran 516 coding sessions — 458 of them directing GPT-6 Astra (via Codex). It wrote ~55k lines of GDScript for the game itself, ~47k lines of Python driving a Blender asset pipeline, wired 400+ scenes, and produced 330+ models and 700+ textures — the character pipeline alone goes concept → parts → rig → animation entirely through agent-written scripts. My job was taste and direction: design docs, art direction (the painterly look took 14 iterations), playtesting, and killing bad ideas fast. Honest state: it's a real, playable prototype — a hub, tower floors, real-time combat, affix system, NPCs, Android build — but it's early. Performance on mobile needs work and there's no full roguelike loop yet. That's exactly what I'd use the next stretch of Astra sessions on. Ask me anything about the process — the session logs are the real story. — GrinZero

What became possible in your product with Astra that was not practical before?