I played Meiling and Yuyuko's cards.
Meiling's : Well it doesn't work quite right, there's nothing to read, the vertical walls are way too long and too fast to enable any strategy. Eventually this is only doable because it is static. By the way, it has quite little life, You can defeat just it by moving once to the left. In order to make it a viable card, the spirals should maybe have some random angle added to them and be more spaced, and the vertical walls would accelerate from a low speed.
Graphics-wise, I don't really like the bullets for the spirals, it makes it just too "dirty", I feel like normal bullets would be fine here. But well, that's only my tastes.
Yuyuko's : there's also an easy safespot diagonally from yuyuko for the butterlies pattern, I guess a little randomness wouldn't hurt here too !
Anyway, I had fun playing these before I found the static solutions (well, Meiling's was still hard), so I guess with some little shifts they'll be really good !