I agree with Mathias, the look doesn't seem like it would require too much textures, if any at all. Maybe a tile or two with a simple two-tone grass-like flourish, but nothing more.
The wood paneling on the house is pretty thin, I think you could thicken the planks up and use a less darker color so it doesn't look so stripey.
Lastly I think you should lighten up the green shadows and do something with the box people to make them stand out more. They are the characters and in a game you should easily be able to tell where they are at all times, etc.
