For those trying to get this working, I've managed to get the game running properly, with English translations active:
1) Extracting. The problem is with the non-unicode encoding of the filenames. You need to specify the encoding when extracting.
Option a) With 7zip:
7z x "Eternal dream of marisa.zip" -mcp=936
Option b) With the "unzip" utility on Linux or MacOS (can also use it in linux subsystem for windows):
unzip -O GB18030 "Eternal dream of marisa.zip"
To check if it worked, look inside the "js" folder inside the extracted game folder. One of the files should be called "新建文本文档.js". If instead you have a filename with nonsense characters, then it didn't work.
2) Translating. The game is in Chinese by default, but it can be switched to English in the options. In the main menu, the "Options" button is the third button, labelled "选项".