Glad to see others working on their own projects too. I tried creating a comic/manga and the art and story were good, but I'm just not good at drawing action scenes to well So I'm converting it to a light novel type format. That way I can work on detail the pictures while not having to do too many!
As for the manga vs comic type discussion, it's like some people above are saying manga is just the Japanese word for comic. When people say manga style it's kinda incorrect since their is no true style to comics, it's just whatever you want. I think the closest thing would be to say Japanese influenced maybe. Since you were influenced by Japanese comics. So Yeah i think the guy above me is right