Great game, but (mirroring LORDLAYO) there is no incentive to unlock characters--maybe if they behaved differently or provided bonuses it would be more exciting--and they take WAY too long to unlock. Also, it is difficult to find the store missions--I would be more motivated to keep playing, unlock abilities, and complete missions if they were more easily accessible (I didn't even realize they existed until I had played for nearly 15 minutes).