Hey I know this. It is project which is made by an indie virtual youtuber. She isn't popular like certain indies but was surprised that she went for this sort of concept
It is translated, upper corner on the right. Japanese, chinese and english are the languages you can pick, apparently they're not machine translated either.
Thanks for sharing the additional information with the community! The fact that this game is not machine translated but rather translated by a professional linguist should make the experience of playing this game more enjoyable.
Helle’s Undersea City Project – Bringing Air to The Garden i7-14700K + RTX 3080 Gameplay
https://igg-games.com/the-immortal-mayor-free-download.html
Japanese, chinese and english are the languages you can pick, apparently they're not machine translated either.