I am saying this with the very best intentions, but the foreground tiles especially are very flat and boring, and the HUD is almost unreadable! The dithering makes the floors look rough and rounded or arched, and that bright blue of the HUD looks really out of place to me, more like a racing game HUD or something. The foreground tiles appear VERY washed out against the dark background. In general to me it is odd to have the environment composed essentially of one enormous 128x128 (or whatever size) tile for the most part.
Sorry for the harshness!