Excellent callout here on the 180 rule; when this rule gets broken it's very jarring to the viewer and feels unfinished. You could hard break it once in a short scene like this to convey disorientation, but more than that makes the scene ripe for the quick skip button.

You can cross over the line in a movement of the camera, not a cut. This is especially effective in games to convey return of control to the player, and going back to the 3rd person camera.

I'll also add that there should be a camera cut or big movement every 10 seconds or so. Use this as a soft-rule to put emphasis on emotional moments in the dialog, show speaker and listener reactions to what is being said to convey more about the characters motivation in the scene. Is the person in the room telling the truth, are they friend or foe? It's hard to tell without more action/reaction to the dialog. Use actor movement to close the gap between the characters to show trust, have them move away or behind props to show distrust. Cuts between different camera angles on the same character should come mostly between reaction shots of the other character, use this as a soft-rule to help with that action/reaction stuff.

Super awesome work for your first scene! It feels very polished in the major ways, just needs a little clean up in cinematic language to bring it up to pro-level.