Very very interesting. Remind me of SNK or capcom fighting game, which is not a bad thing at all. I really like your style
I might draw fanart characters of your game in the future, especially Lynn, since her clothes reminds me of the Bride who I love so much from Kill Bill XD
EDIT :
I tried the demo. Very interesting and very neat idea for battle system! Although, I have a problem with combo numbers still floating around even though the enemies are already ko'ed. Also, you might wanna include the font you use too, since I don't have them :P
Another point to consider would be information about skill. It's pretty difficult for me to remember all of those information, so it would be really helpful for user to have some info windows tell us all the information of each skill when we have to look through them in battle scene.
There are also some sprites glitch, such as the original sprite showed before the attack animation is finished, I think you might already know that but just in case you don't.
All in all it was a very interesting demo. I'm looking forward to see the finished product of this. And if you need any help, feel free to ask