Oooohhh what an illusion that someone tries it!
You're right. I have finished translating it and I have uploaded it as soon as possible but I did not fall into the menu. I'll get to it.
At the beginning if you press controls you will meet Mike who explains how to save and that.
The verb undo is because there are many objects and many combinations between them. Sometimes you have to undo something you have made so that it will put the objects separately.
Hopefully you keep playing and keep telling me the things that can be improved.
A million thanks