Opus 5.5 made me a launcher for Red Alert 2 that skips all the menus and directly lands in the game with perfect resolution and very good performance. It even fixed a lot of bugs with the game and added some custom units and a lot of balancing. I didn't publish it anywhere because of copyright worries, and everyone can do this with a couple of prompts anyway.
BTW, for the balancing tests, it decoupled rendering from game logic and can run 32 parallel games under my good old 3950X.
What I'm trying to say is, after seeing that, I think this doesn't surprise me at all. Just a couple of week ago this would have blown my mind.