Great game so far! I like those talking vehicles...
Maybe this could be useful?
-One of the "bridge" tiles is not a wall (first on your left in title screen and two on "radio" screen)
-There are trouble with the down exits in the third screen to the right. I think you should consider leaving more space upon the exits down to this screen, or else the avatar keeps doing the yoyo between two rooms.
-I found an unintended ending at the down right corner when leaving the "HQ" screen.
Hope i don't spoil anything... Keep it up!