If you're really going for a 9-11 agegroup, go easy on the code design and modelling bit. Have you ever tried RPG Maker? Especially, RPG Maker II was for PS2 and its code design editor was horrifically hard. It had no modeller, but a big pile of boxy, cartoonish graphics that you could change the color,scale,etc: of.
Back on the subject of the game maker, It looks great, I think the limited viewport will make little (if any) annoyance.
Back on the subject of the game maker, It looks great, I think the limited viewport will make little (if any) annoyance.