The missions become increasingly difficult to the point of impossibility as the AI on your side remains as simple as from the first mission, making it easy for the enemy to overwhelm you regardless of strategy.
2/5.
Best Freerun: $4,059.50 collected, 79934 feet at highest elevation, 46:34:46 duration of flight (because I was getting tired of continuing), for a total earned of $90,663,085.20.
It would have been a 4/5 game, but Level 25 was not fun, not intuitive, and not even worthwhile. I spent 35 minutes on it, getting below 20 at least 30 times in that period, only to have to start over at ONE HUNDRED.
POINTLESS TEDIUM IS NOT "THINKING", IT IS SIMPLY TRYING TO FRUSTRATE THE PLAYER. 2/5.