In good faith I am sharing my game Operation Undead Capx file with Construct 2 developers so that they might learn a bit about how a game should be structured and how to do the difficult level select. Its organized enough so you should be able to tell what events affect gameplay. If you have any questions about the coding let me know so I can help you.
If you have the time and can support me by downloading the android version of the game its here
https://play.google.com/store/apps/deta ... dead&hl=en
Any questions just ask!! C2 is awesome!!