This idea i think will help people who are more into the game are in it for the long run.
The basics of the idea is that we have a counting system in which the game counts how many troops each tower kills during each attack and also how many troop it has killed overall.
Example

Lvl 8 wizard tower
last defence: has killed 2 giants, 1 hogs, 2 drags and 35 archers
overall defence: has killed 17845 barbs, 23678 archers, 746 giants .....

so on and so on


If you think this idea would be great please comment and suggest some improvements please