You can use the collision statement saying
if wall collides with enemy
Kill enemy
Set score to score plus x (if you have a scouting game attribute)
Btw x can be any number
Also to create a wall use the updated statement saying
If mouse is clicked
Create wall at x and y of mouse
Move actor x and y of mouse plus x
I didn't really get enough (reasonable) information.
1. When the wall is being built, how do you make it look like a rather slow laser beam being shot?
2. After it has been built, how do you have the smaller half of the quota be filled in?
3. When an enemy touches a wall that's still being created, how do you make an enemy shoot a particle which rides the wall? Also make it so when the wall has been built, kill the particle so the player doesn't get hurt?
4. How do you prevent a wall generator from being made outside the level boundaries (aka the box)?
5. (This might be the easiest to answer) How do you restrict the game into having a maximum of 2 wall generators at a time?
(I still have many more questions, but I wanted to take it easy with the questions.)