This is by far one of the nicest koi-koi apps I have ever played! It really does make it feel realistic. The sound as the card is slapped onto the table, and the realism of the lighting is a nice touch. I wish we had further development of this game! It's unfortunate that the settings option for the game are non existent. I would like to at the bare minimum be able to chose between 3rounds, 6rounds, and 12rounds.
I would like to add to this comment by saying. I can see myself enjoying this as it is, but for someone new to the game. I think it would be difficult for them to grasp what is happening. Some rounds are scrapped, I guess that is what you call a void round. I'm not sure what that is, and it is not explained as it is happening in the game. It is confusing to see a round automatically end, and not have an explanation as to why.