Honestly, this reminded me of RTS games that I've shyed away from in the past because of the visual complexity, but once I got past that and put myself in the game, I had a lot of fun. It got pretty suspenseful when I was down to my last unit.
I think there could be a better way of indicating what spaces you can advance on and which spaces you can't, since I ended up trapping myself in a loop of advance/flank because I did not realize I couldn't move over a certain square on the map.
The art style is beautiful, and having said my comment about the map I love the way it looks as is.
The music is also very fitting. I think some sound effects could be a nice touch, like an explosion from blowing up an enemy on attack or something.
Overall very nicely done and well polished!