Nice to have more Touhou friends in the game. I'm using it on Factorio v2.1 and it works just fine.

The only thing I could think to improve upon is changing the fish breeding icon into two of Wakasagihime playfully swimming in a circle together; maybe have her spoil into a shell that contains her music to be stored in boxes? A little novelty item.

hello, pretty rare to have touhou friend in the game, and yeah, I nearly forgot about space age dlc part, I maybe also add the nutrient from fish into something else while at it, thank you for reminding me about the space dlc, I will try to allow the mod installable both space age and normal base game.

The icons are cute. Poor girl knows what's going on with becoming nutrients.

Given the long spoilage time of fish, it would still be a fun novelty if she turned into a music filled shell after 'spoiling', implying that she eventually escaped and left her song behind instead of dying helplessly in a box. A tiny fuel value would allow burning the shell without becoming clutter if that's a concern.

Also, you can set the mod for 2.1 since it has no compatibility issues.

I really want to but, I'm not sure how to make spoilage to be either shell or a normal spoilage, I read from forum that it's can cause performance hit to make my own custom spoilage so it have probability, and also if the spoilage in stack of chest also might cause a problem, so....

Not sure why it would need a probability. If she spoiled into only the shell, then it would be like any other mod that does unique spoils without a performance hit. If the shell had a tiny 250kj fuel value, then it would be burnable exactly as normal spoilage to prevent taking up chest space too.

It would function identically to normal spoilage, just by being a single new item that only Wakasagihime could spoil into. No probabilities required and still acts like a novelty cosmetic item for Touhou fans.