The combat mechanics is very good a little bit hard to understand at start (I think I really start to understand what I was doing after the 3rd bug ^^') but very interesting, and I think if there were more different tiles and if the IA was less "dumb" (this is your world ^^) you could have a real mechanic for a complete game very cool !
Graphics are really nice too, especially the characters, "crash test dummy" and final bug ! :)
Very good job ! ;)