The style is simplistic, the advantage is that it can be read by a child.
The style is old, very old (1895), the story is too short, it lacks detail, depth.
4 stars Why you say?
Well, because after all, the story is worth reading (everyone knows this machine, but who had read it before?). The book reads easily and provides access to real time travel, a much more complex book, searched and attractive in my opinion:
The Time Ships
.