Great screenshots! I like how the tower seems to be in an oasis. Wonder what the Seeker's deal is.
That battle background seems familiar somehow. It's not custom, is it? Makes me think of Final Fantasy on GBA, or maybe the RTP...
The Pokemon name/level/HP text feels a bit cramped in the GUI. I think increasing the boxes' height by a pixel and nudging the HP numbers a few pixels to the right might help.
I'll give the demo a try when I get the chance. Keep up the awesmoe work :D