I'm a little disappointed by 13. For one I really am not fond of the
bomb trance system, mainly because I feel as if ZUN is going more in a direction of being really good at collecting stuff and killing things at the right time, rather than being good at actually
dodging bullets. The boss fights are kinda nice though, it reminds me of Shoot The Bullet where you're rewarded for making a kamikaze rush through the bullet pattern to get face to face with the boss. But then the bullet patterns themselves didn't really wow me this time around. :/
Also PCB had the best playing/scoring system ever. The good days where spellcards were awesome to watch, and grazing bullets like a crazy ***** really meant something.

/hipster