Good stuff.
Grammar is good, however, I suggest that you expand on your vocabulary. Like don't get me wrong, right now, even if you don't change a thing, it's very easy to understand. However, if you do improve your vocab and switch some of the words, I believe it would help improve the flow of the story.
Really nothing else apart from that.
I read 13 chaps and I liked it.
Good job bud.
seen the pun