This is a science fiction tale about time-travel into the past in order to change the course of history.
By themselves, I don't believe those elements fit the definition of steampunk, which is, as I understand it, a re-creation of the Victorian-style science fiction, with technology powered by coal and steam, in forms that either extrapolate from the theories of the time, or at least take flight from an imagined version of that kind of tech. Internal combustion, electricity and other later technologies are, if they exist at all, in a very primitive, fledgling stage.
You could think of steampunk as a re-imagining of the future from the point of view of a Victorian science fiction writer. Its inspirations are taken from the SF writers of the era: HG Wells, Jules Verne, and many others.
The narrative language of steampunk is most often a more formal style, reflecting the way the language was used at the time. Other sorts of SF and fantasy elements may also be introduced, as long as the basic conventions of the sub-genre are met as well.
Your tale is a fun read, but it has some technical issues with verb tense that you should take a look at.
Best regards,
CeruleanSon