Just be careful playing critical mode. Don't underestimate the difficulty. A little strategy for critical mode. Focus mainly on getting as much abilities from your dream eaters as you can. It takes some time but your lvl and stats will go way up.
I hope so too. I hope that it's going to be like birth by sleep, playable by sora, riku and kairi with each theire own storyline. It should definitely have the same attack deck like in dream drop distance