I quite like your dithered shadows, they really help make the objects feel solid and shaded.

I also like how illustrative the tiles look, as if they were translated to pixel art from a story book. 

I think you might find building a scene with these tiles to be a little tricky, as they're mostly not designed to tile seamlessly. The brick wall for example has the 3D tapering, which looks great in isolation, but probably a bit weird when placed beside itself. The shadows on the fence tile wouldn't tile smoothly either. 

Perfectly acceptable for an old-school puzzle game though. They look great!

I think I started to recognize your style