Scoring correct clicks on a Software simulation

That sounds like the screen-recording test mode. Here's more info about that:

• https://community.articulate.com/series/articulate-storyline-360/articles/storyline-360-recording-your-screen 
• https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-insert-screen-recordings#test 

However, since you've already built a custom simulation, you'll have to do the programming to track the scores. How to do that depends on how your simulation works.

One option: you could use a number variable, and then add triggers to the clickable spots that either add to the number (if it's the correct spot) or subtract from the number (if it's incorrect).

Then, on your custom results slide, use the value of the number variable to show the appropriate content about their score. That could be done via hiding/showing objects, changing states, or using layers (like the Success and Failure layers on a standard Results slide).