I think the tileset is very impressive, and greatly detailed. I would like to know whether it was made pixel for pixel or using filters, and how many colours your average tile uses.
I think the GUI thingie on the top left side looks pretty spiffy, the colours are great and it has nice details. But I have to agree with Kaimetsu (brr

) that it looks too flat. The thingies on the right side are not all that great, I think, although the borders are nicely done.
I am looking forward to see whether you'll manage to have character animations that look smoth and still fit to the details of the tiles.