What would you change/add to this game?

Hi, I am trying to create a small fangame that fixes some problems or adds a fun twist to the game.

My idea is:

Since I'm make this entirely singleplayer, I want to change the enemies. Instead of the tower having a single hp bar as a whole, that gets divided into several enemy monsters in each of the slots that have their own hp bars.

This makes possible to create new weapon abilities like AOE weapons, chaining attack weapons, Stunning enemies, weakining / slowing down enemy attacks and so on.

Any thoughts?