Two problems; 1. Despite the fact that it is meters ran, if you move up or down it goes at the same rate, to fix this you could do time survived instead, 2. The flamethrower unit is the upgraded grenadier so it still says grenadier instead of flamethrower soldier
Being pursued by a chasing zombie, out of boost, almost out of fuel. Ran out of fuel. Zombie jumps at the same time. Zombie way overshoots its jump. Zombie cracks its neck on the conveniently placed rock.
I couldn't beat the fourth level then tried this strategy: Only upgrade castle archers and income, then sword damage then giant and spearton. In game buy two or three swordsmen and buy another miner. If attacked by anything but a giant retreat, the arrows will kill them. If its a giant attack. Get at least 5 miners and at least 10 swordsmen (not in that order). Keep retreating if attacked. Max out your units with units of choice. Attack when 20/20. If your whole wave dies defend base and attack again at 20/20.
Should be a "Picky" achievement for making the game add an extra digit to the score, avoid finishing the game for a while, be on top of the score box when you shoot it and so on...
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