Save The Kingdom: Merge Towers Android Game Description:
The gameplay is similar to Tower Defense, but the player must defend not a road, but a barricade on which he places various units and towers. The field is divided into cells, in each of which one unit can be placed. This limits the number of units on the wall.
Units are upgraded by merging - by combining two of the same units you can get units of a higher level. There are just over 20 levels of units and 10 maps to play. There are various ratings available.
