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.
Perhaps the dev studio either hasn't yet realized the potential for English sales with this game or it is currently working on an official translation but is struggling with the process (See my linked explanation about translation in my above post). Who knows whether the dev(s) or professional linguist(s) are doing the translation, if any?
Broken and awful port
Just check steam