Looks very good, but I agree that it's a bit crowded. I feel like my vision should be drawn to the woman/child, but it instead goes back and forth between the (very beautiful) altearth logo, and the title of the book.
If this can be changed quickly I would do it, but if it can't I think it's still more than fine.
... You want someone scrolling or looking (like at the also boughts on Amazon, or other screens on other vendors) to stop and look more closely and click to explore.
That's my two cents.
I did not write to those markets, but then again I don't really believe in those markets. For about twenty years I had all my history teaching material online--essentially they were web-based essays. I wrote them for my college students. But from early on, I got email from both students and teachers not just from high school but even from middle school telling me the essays were easy to read. I did not hesitate to use longer sentences, did not blanch at using foreign words as needed, did not mollycoddle the concepts. I began to suspect this business about reading levels was more than a little contrived.
I also recalled that when I was in my early teens I was reading Wells, Verne, Poe, Bradbury--people who wrote grownup books for grownups. And while I did manage to get all the way through The Island of Dr Moreau without knowing what the word vivisection meant <g>, I still appreciated the story. They didn't even need to put a YA-appropriate cover on it.
In short, I don't believe in changing one's writing to suit a particular age group. Write the story. Some kids may love it, some may be bored, some may be baffled. Teenagers love, bore and baffle with ease, sometimes all at the same time. Even though Talysse is young and even though she has an identity problem that is the focus of the book, I wrote it because I found the problem interesting. If YA or NA also find it interesting, that's great. If *anyone* finds it interesting, I'll be delighted. But I'm hoping that an adult that reads it will not be thinking "what an interesting YA novel." I can do without the modifier.
Sorry for the rant. It's a bit of a peeve of mine.