I have a storyline in production that will be turned into a visual novel in the near future and I'm wanting to incorporate the point and click freedom this game has like the apartment environment and PC. What engine/s were used to make this?

[P.S haven't been able to put this game down in days. Keep up the good work!]

Unity for gameplay and Live2D for animations i guess

Indeed as Reunoren said Unity is the engine and animations are done with Live2D. Unity is very versatile and allows you to make pretty much anything you want, but comes at a price. You NEED to know how to program and I don't mean basic knowledge. You NEED to be good at it to make something that isn't trash. If that doesn't sound like you just use Renpy.