How does Being A DIK dev make free roam sections and transition back to it mainly being a visual novel?

[Mr. Mayhem]

I'm interested to see what type of code he did to accomplish this.

 

[W3NTZ]

It is probably made by few screens linked together with labels containing hard pause. Then there is some action which end the free roam and continue the VN mode.

 

[Le Pew]

It's simpler than that. He creates image buttons for the current state (or start) of the free roam event and then calls ui.interact() to wait for the user input, then handles the click, and goes to the next ui.interact() for the next action. The rest is standard Renpy behavior.