the pixel work might not be so good but the animation is really awesome. 

Not really, I didn't even know that game

I got inspired by Golden Sun style (concerning the movements, not the artistic part)

Inspired by yie ar kung fu ? (old game with similar-looking animation)

First of all, thanks for your opinion

Using only a few sprites is intentional beacause I don't really want to spend too much time doing more right now. The reason for this is that I would like to start programming the game as soon as posible and I've scheduled to do the battle system firstly, so I need some graphics.

I'm likely to make more complex animations in the future for the battle characters, even though they aren't my priority at the moment.

The first large circle slash doesn't feel like a slash- it feels more like the sword teleports while half a ring magically appears. Make a few tweening frames there. The second one has the same problem, but due to smaller movement isn't quite so bad.