I think something that would be fun is that they add gestures to the game.
What do you think about these while a game can use an angry gesture of laughter ect.
I think this would help one interact with the opponent while playing the game would be interesting.
The creators will say how annoying haha but I hope that in the future I will also add.
AND too, Phrases like good luck, well played, etc.
Hey Erick! This is a great idea! We will share them with our team during our next feedback session! I’ll take note and will forward for consideration!
We can definitely see how implementing more social aspects to the game would make interactions fun. 
Heya! This suggestion has been brought up many times by the community and already, in fact, our devs is considering adding that up in one of our upcoming updates.
~ CM NekoRei