Alright, I checked. It works fine for me and I used both a movement key (Right Key) and the action key (Z) together, have you tried that?
Can you send us your save file? That way we can test and if we move past it, we'll save it for you and send it back.
Why don't you join our Discord, we can help you easier there (We are also more active there): https://discordapp.com/invite/uupkYJU