This seemed like it would bring in more philosophy to this series, and perhaps teach a lesson about consumerism and recycling, but the deus ex machina ending just brought in the Sortrix to wipe out the problem with little effort. I was a little disappointed, but readers are not really going to care.
The real draw of this series is the mile-a-minute adventure filled with colorful full page spreads of the futuristic city, a fun story about space travel in the company of aliens and robots, and the typical colorful font that makes younger readers interested. There aren't a lot of space adventures for very young readers, aside from Courtenay's Space Penguins: Galaxy Race and a variety of emergent reader versions of Star Wars. Hand the Spacemice series to readers who devoured all of the Ricky Ricotta books.