Kindly please check if I did this right.

I'm sorry.

I'm so noob at construct 2. It works but I'm having a second thought if I really did this right.

you did not explain what are you trying to do but looking at your code i can say you could use families for the monsters so you use less events-loops

see here https://www.scirra.com/manual/142/families

also take a look at functions https://www.scirra.com/manual/149/function