something about the way that the dresser/cabinet and table related to eachother bothered me from the first time I saw this. I couldnt quite put my finger on it, so I pulled it into the workshop to try and tink around and see what was up. and it hit me after a while;
You have no walls. Sure, the outline of the ceiling limits are there, but you have no visible, depth-creating walls. so, to start off, I added a wall relative to the dresser, seeing as one would usually place it there.
it looked better with the dresser, but the table looked even worse. because from that angle, the table would be jutting through the wall. so with some work, pulling the table forward made them both look like they were from the same place/dimension. Not only that, but when the table and dresser showed depth, it also helped the characters to have a feeling of existance rather than placement. Another thing to help that out would be shadows, to make things seem like they are ALL being hit by light universally. The table is demonstration. While you say you want everything to be gridbased, it wouldnt hurt the layout to have the grid be only about half of the characters height. I do think that the only way this could work would be if you took the Legend of Zelda like route, making the walls all central based and the objects topdown-ish. Hope this helps a bit
I always love to see your work.