This is exactly the type of application I am interested in as well. As a hobby game dev with only mediocre pixel art skills, having a generator to finish the busy work would be an absolute lifesaver. I'm also interested in using it for fleshing out artistic vision through generating variations of an initial concept.
Hopefully we aren't more than a few years away from something practical like this.
You can tell from the video that this game shares a lot in common with stardew valley. I'm assuming he's reusing the engine and even some art assets for UI, etc. Curious to see whether the final product differs in look and feel enough for this to be a unique standalone, or whether it will feel more like a total conversion mod for stardew.
I would love to be able to pop this open for prototyping simple python/js scripts, but the lack of "run" support makes that much less feasible. Curious to see where the next iterations go.