Scary: two projects built by prompting Gemini 3 Pro
A wishlist app with real sharing rules, and a 3D ship game in a library I barely know.
After the wave of praise for Gemini 3 Pro and the new Google AI Studio, I wanted to see for myself. I gave it two projects: one complex enough to properly test it, and one in territory where I could not rescue it.
Project 1: a wishlist app
Wishlink lets you add wishes, share a list by link, or keep it private for friends. The interesting rule is that friends can lock a gift, other friends can see that it is taken, and the list owner cannot, so the surprise survives. It is available in English and Portuguese.
A detailed first prompt produced a working site with minor bugs, and later prompts kept the context of the whole project. Moving it to Vue went without problems. I expected adding Firebase to break it, but all I had to do was set environment variables and adjust the security rules it had mostly generated.
Project 2: a ship simulator
The ship game has you steering with a joystick, fighting enemy ships, recruiting them into a fleet and upgrading power and size. I barely know Three.js and find 3D modelling hard, so this one was all prompting, right through to deployment. It is best on desktop.
Where it cracked
- Every wishlist page load fired more than 40 requests.
- After ten or so rounds of trying to prompt that away, old bugs began to return unless I reminded it about them.
- The ship game hit the same wall, with fixed bugs reappearing and mechanics being replaced.
So I stepped in, fixed the database issues by hand and shipped a usable version after about two hours. Call the wishlist 80% vibe coded. The game was 100%.
Verdict
These were not demos. They were complete builds with migrations, frameworks and a backend. The limits do show up, but not nearly as early as I expected, and that is the scary part.
Originally shared on LinkedIn.