Okay, I will not pretend that this is an objective review, rather a re-visiting of a something that was special to me as a child.
My re-reading of it came out of a book-group discussion on the first books we loved, the books that formed our reading. When I mentioned The Wonderful Flight to the Mushroom Planet, everyone stared at me like I was nuts, but it made me want to go back and find it. I wasn't sure I would be able to, if it even still existed. Lo and behold, on my birthday, a few weeks after the conversation, my wife handed me a copy of it, neatly wrapped.
It is a story of 2 boys building a rocket-ship and, under the tutelage of the mysterious Mr. Tyco Bass, flying to a tiny planet that no-one knows exists to save the people who live there. It is a simple and sweet book, definitely a boys' tale, an adventure full of hope and naiveté, with just enough danger and doubt to keep the pages turning. And there is definitely a sense of magic and fantasy underlying the science-fiction elements of the story.
Did it influence my future reading? It's hard to be sure. However, it wasn't too many years later that I discovered Ray Bradbury, and read everything of his I could get my hands on. From there it was the worlds of science fiction and fantasy, which formed my primary reading during my late teen and early adult years.
One thing. If you do seek it out, I would see if you can fine a copy of the original edition. Mine is actually the Scholastic Press edition, but I wanted to show the delightful original artwork. The SP edition has covers and artwork based on the original, but some of the magic is lost, as it is with the newer edition with all-new artwork.