How do I know if I've finished the game or if it's in the loop Because I got to a part I only talk to June but after that I can't move on to other interactions
The walkthrough in the phone (cog icon > walkthrough) contains all of the scenes and possible outcomes.
At the moment, June's content goes as far as the cooking/photoshoot scene, after moving to the new house. More content for her is coming in the next update. :)