This Swallowed Star Has Started Growing Mushrooms

That's an idea, but not big enough. Don't try to limit your creative potential. You can cultivate fungi in your toilet and let them spread throughout the city via the toilet drain, covering the entire globe without leaving your home. You wouldn't need to spend any money on meat at all.

Your imagination isn't big enough! You've already written about fungi, why just use them as a plot device? Humans have races, animals have demons, insects have insectoids, so you could easily create a fungal race! The seventh pinnacle race! That would be an unprecedented idea, and the traffic would come right away!

It's a bit of a wild idea, as you can tell from the synopsis, but it's not that big of a concept. Since it mentions parasites, why didn't you think of the Zerg's parasitic abilities? I once read a brilliantly written novel about the Zerg, and in just seven chapters, it already had 200 million Zerg, and then they overwhelmingly defeated them in a single battle. And this fungal one... I remember some fungi have incredibly powerful parasitic abilities.

Why did he become Thor's apprentice? 😰

The first twenty or thirty chapters are pretty good, but I've skipped the conflicting content. I hope there will be less of that kind of content in the future. As long as the future setting and plot don't introduce any problematic elements, it should be readable.

I thought Swallowing the Stars was a green-skinned mess.

The author's idea (True Indigo + Devouring) is quite good, but the writing style is lacking.

This is the third fanfiction about Swallowed Star that I've read that features fungi.

Why not hybridize them into a green-skinned orc?

I thought the Warhammer Greenskins had arrived.