Hi ImNoki. There are a few things to do to get a correct animation:
1) There must be a single and unbroken stroke in the PATH layer.
2) The stroke must be made with a pixel perfect way.
3) The combination: path length, frame duration and animation duration should be chosen appropriately. Example of a bad choice: frame duration 0.1 seconds, animation duration: 0.5 seconds, path length 100 pixels (this animation will not be good, because it'll be very jittery, around 25 to 25 pixels ).
If the speed of the animated object is too fast, you will need to add image effects such as object shadows or decrease the frame duration.
If you couldn't solve the problem, send me the .aseprite file at firstname.lastname@example.org to analyze the layers.
I hope this helps!