power up

i think u should input power up towers such as:

speed tower, gain +"percentage" attack speed.
range tower, gain +"percentage" attack range.
damage tower, gain +"percentage" attack damage.

and hevyer creeps combining the different attributes. regenerates and slow immunity on the same creep will be quite difficult... that way u can feel that the game goes on and on for a longer period and strategy will be different and harder i believe, what do u guys think?

I don`t think that it is an good idea to change Towers or Creeps or add other Towers and Creeps.
The Creeps have their attributes, and it is enough.
It should not be even more complicated.

That is just my Opinion

I agree with ellie.