Thanks, Gesan! Yes, I could make them better, you are right. It's a matter of time, if I spend to much time on animation, the game won't be finished until 2 years (I'm alone to do almost everything - except sounds and translation), so it's a choice not to spend to much time on animation at the moment. If I have time, I'll improve them as much as I can. Thanks for the feedback!
If it's the jerking you were talking about (and not graphic part of animations): it's a demo, I didn't spend so much time to get ride of all the jerking, but I'm going to improve this part. I have already done some improvements. The demo doesn't reflect the quality of the finished game! Have a nice day, and thanks again :)