Nice review.
A couple things worth mentioning that didn't make it into the review:
1. The game is quite moddable, with a small mod community actively working to create new content, which helps to extend replay value.
2. As pointed out, the battle engine is kind of hard. It's easy to use, it's just hard to win battles if you don't have a sense of tactics -- just diving straight in will get you killed. However, combined with point 1, it's easy to create a mod that allows kids to play and win, just by increasing the strength of the initial ships.
Disclaimer: I'm one of the Fearless Testers listed in the credits. This gives me loads of perspective, since I've played a lot, but does color my view positively. I have no financial interest, though.
Your mileage may vary.