Seems visulization is still too expensive and sluggish. I tried to build things like tetris and snake eater with fable5 and got-5.6 sol, 90% of build successful in one shot and remaining needs 1~2 rounds debug. The whole experience is much better than months earlier, where a snake eater takes me 3~4 manually compile/run and input the error message and abnormal manually again and again.

But I am curious about building a larger scale game with/without professional engines like Godot. I highly doubt the model/agent is intelligent enough to setup the entire development environment correctly, thus may be struggle to test and debug themselves. Maybe something like GUI-agent a future?