Sorry, but 30 pages for an entire book? Absolutely not. That would make like a 60 page book. Now if you continued, yes it could be.
I have a book of 107 pages (not double-spaced) and I still think it is short. But, I have yet to finish.
But no, a mere 30 pages is insufficient for a full chapter book. If you are trying to say something else, then I might have read the question wrong. Are you done with the book yet?
Supposedly, if you double-space the whole thing, that is how many pages you will have in your book.
I could critique it, or try to help you extend it. You are welcome to email me.
Hope I helped.