As a child unwillingly trapped in a grown-up's body, I absolutely LOVE the idea of an RPG based around action figures! Props to you for coming up with this!
PS. I really like how- even in such a minimalist system- you've gone to the effort codifying and detailing personality and relationships. That stuff can be hard to come up with, but it's so important to a story!
PPS. I love the mechs haha