I just finished reading all 9 "Leo's Basics" and I have to say that this is really awesome. It's educational, interactive, fun, the art is colourful and cartoonish: what else would you want? I would really love to play this one day, no matter the age. Also, what I like the most of all I've seen is actually the Doku, mainly the symbols you placed beneath each image in ... the 6th page was it? People like you really deserve to be on dA and many other places!
Just a few notes; - Why is Rose's workplace at the 2nd floor while Jim has his workplace at the 1st floor? It would be more practical for Leo's mum to have her workplace at the same floor as the kitchen, the laundry room and the garden, wouldn't it? - The trees don't really seem to be part of the tree-house. For me it looks like they are just standing behind it. - The stones on the way to the garden look a bit too big to step on it. Maybe try to use a little bit less shadow or outline? Beside that; It looks really nice and I would like to live there too. And it fits perfectly with the rest of Leo's world.
I simply cannot get over the whimsical style of everything in Leo's Forest so far. It's all so calm and peaceful looking, with the exception of the Doku of course. This house takes the cake though. It's whimsical, but you managed to make it a feasible living space at the same time. That's actually very impressive given the style.