Actually, that's pretty good, keep it up! If I were to give you pointers, it'd definitely be to work on the drawings themselves a bit more. You're animation is actually pretty good, for such a low framerate. You managed to keep it from being slow and super smooth, but didn't make it jerky either. Also, kudos for making it anime OP themed, you had all the right stuff in there for that. :D
Ah, thank you...
I dunno if it's low framerate, it's 24 fps like any TV program. Although I think the only things that aren't animated on twos are the motion tweens, because, well, they're motion tweens.
EDIT: Oh yeah, and the text isn't on twos either.
In case you want to see it (even though you would probably have already found it), the original opening I referenced is
here.
And if for SOME REASON you wonder if I translated the Spanish in the subs (I don't know why you would wonder that), I translated the Japanese myself.