I am not a teacher.
But they both sound fine.
'Into' is used specifically for movement, and might be technically better. He went into the room.
"In' could be used to define where something is happening, OR it can be used for movement.
He went in the room. OR He played a game in the room.
But there is no ambiguity with your sentence, and I think you can use either.
If your verb was different.. not 'get' but 'danced'.. then you would need to use 'into' to describe the movement into the room. I danced into the room.
If I said, I danced in the room, there is no description of movement. It meant the room is the place that I did my dance.
