You can change your system locale to Japan (Language for Non-Unicode Programs) and then Pokesav will display the Japanese language properly.
That is what i did and it shows up properly in Mine
Did you disable the Soft reset in the Wood R4 Menu?? I managed to start playing only after disabling soft reset!!
Try it! You should be able to play it then!!
I didn't know they made an MSU cart for the Genesis.... I knew about the SNES one and the library for that is rather large but the Genesis one has very few games