Man why can't they just make a simple live tetris multiplayer a la Game Boy to Game Boy?
This isn't awful, but there's no incentive to play a game if you can't compete with high scores without powerups.
A 3 pack of a single powerup (there are 5 or so different ones) averages 4000, and you make 250-350 a game playing without them. The highest amount of coins I've received is 550, and that was a 260,000 score game with all 3 slots filled.
I don't get in a tizzy about IAP but this is one of the most egregious implenentations I've seen. Skip this.