So far I have been playing AWE by clearing the levels of all towers (I completed only the first few levels though). And although it was not difficult to play that way so far, I wonder if it's actually worth doing since the amount of money gained this way is miserable, levels get quite longer and I think I could have completed all the levels so far without destroying all the towers but by just passing through the "easiest route".
Probably there's an impact on the final score but by "worth doing" I was thinking of something like level/vehicle unlocks. And also if one gains more noticeable amounts of money by destroying stronger turrets later in the game (since in the first few levels destroying all towers meant gaining barely enough gold to buy one more cheapest vehicle)?