Why not document the functionality, excluding user interface and API calls? You can do it yourself, but considering that you have a busier life, you could entrust that responsibility with somebody with experience with Construct 2.

You know, I would genuinely like to continue this. Honestly, I could learn as I go and I am willing to make that sacrifice to complete this project, finish what you couldn't, and add more. I do not care if the engine is old (It is Construct 3) but I am willing to learn Construct 3 to continue this project. If you want to talk further, my discord is @kanadisch

Please reach out to me if you are interested! :D

What tool did u use? i want to start a project with my team but it would be helpful to have the source code. We could use some code snippets what would make developing such a game much easier