Eh it's ok.
The animation is nice. The voice actors need a bit more tuning. The girl sounds way too much like Raven from Teen Titans... *no more of these characters, I beg of you!*
The monsters were either inspired by the guy from Spirited Away or from Bleach.
The story line itself was a bit generic: average kid goes about living his daily boring life complaining about nothing ever happens. Some extra-terrestrial comes shooting out of nowhere landing on him and "turns his world upside down." And now he's caught up in a fight to save the universe...blah blah blah.
Well, I guess you have to start from somewhere, right?
I have to admit, it's cute using the Zodiac. I'm sure we'll be introduced to 10 more signs...one or a few of them probably being bad guys, as storylines like these usually goes.
Anyway it's an average start. You need to work on your action scenes a bit more as they look a bit too slow. I'm sure that will improve as your series continues.
Good luck!