Suggestions

[spAce]

Sounds
A sound for when a game begins (after the "Waiting for Players" screen) and a sound at the beginning of each sacrifice stage. It could be toggled on/off in case other players do not want the feature.

Resign Button
A more user friendly button (possibly on top of the "Camera" button with a confirmation window when pressed) for resigning from a game. I feel that most players (especially new ones) do not know how to quit the game properly so they close the application and leave the other player waiting for an unnecessarily long amount of time.

Opponent Timer
It would also be great if a timer was implemented to show how long your opponent has during their turn. Most times, I'm unsure whether the game client has froze or if the other player is just taking their sweet time.