English not supported. Perhaps sometime in the future the dev can start with an English Interface translation (Easiest and least expensive). If a fan base develops and increases, perhaps English Subtitles can be added (Most difficult and most expensive). See my explanation about translation.

06/25/24 - Update:
Don't want to wait for a proper English Translation of a non-English supported game but want to play the game now?
You can try to use the freeware "LunaTranslator" combination text hooker (text grabber) and language translator application (GitHub page | Download page) to machine translate or AI translate the game's native text into English (Note: Machine translation is 1:1, word for word translation. Some ideas may get "lost in the translation". AI translation attempts to mimic a natural speaker's translation of a language into English (I haven't tried this method yet)).

See the verbose "How to" demo video posted by "Daiya" on YouTube (Note: From her dialogue in the video, Daiya seems to be a teenage girl, so try to bear with the "quirkiness" of her dialogue with the viewer [you]. She set LunaTranslator to use AI translation [See the improved English translated, purple text in the screenshot]).
In the past, I personally have used the AGTH (Anime Games Text Hooker application with the Atlas Japanese-English translator application) to try to play untranslated Japanese H-games with machine translation and just discovered this combination text hooker and translator application that supports AI translation (An improvement over machine translation) so, if you have any in-depth questions then it's best to visit the dev, "HIllya51"'s Q&A page on GitHub.

This game is interesting. Reminded me of the game a space for the unbound.

Edit: I fiddle with the settings but sadly there is no English only mandarin. Welp ima gonna put this game on hold for now and wait for the official or fan translation cause this game looks good.