Zombie Defense - Plants War - Merge Idle Games Android Game Description:
Each level is a field with an area for towers and paths mobs attack along. The mobs are undead, and the towers are flowers and similar plants. Tower plants can be upgraded by merging two identical towers. As a result, you can get a tower of a higher level.
There are a total of 70 kinds of flowers. The game is divided into chapters, each with about 100 levels. Trees can be rearranged within the playing field right during the game. Also, there are various boosters available.