Sure, with the next updates I will expand more the 3 current routes that are in the game now, and the NTR theme will be more present.
The audio messages are planned but I need to request a commission to a voice actress (I'm still thinking about adding something like just moans though)
For your third point, can you only see one image? currently there're 12 images divided between 3 routes options, to see them you can go to the settings app and reset the chat to be able to repeat (I'm working on a flowchart system too to make that more easy).