Your stick figure movies could improve with a few small adjustments.
Focus on making these adjustments for future episodes and each new instalment will become increasingly successful overtime.
The stick figures have some very stiff poses.
You can loosen the stick figure poses by using a line of action.
You draw a line pointing towards the direction of your poses.
Draw your stick figure over your line of action.
You could even draw the line of action on a layer under your planned stick figures.
A line of action is an invisible line often use to make poses of cartoon characters more Dynamic.
The best stick figure movies often apply a line of action to their character poses.
exaggeration and Dynamic poses will really help sale the fighting better.
Your backgrounds should use a more contrasting colour for the outlines.
Your stickmen are black but so are the outlines of the entire background.
Use different colours for outlines and your stick figures will stand-out a bit more.
Throw away your ideas on how a cartoon is supposed to look.
You can use different colour outlines for characters, trees, grass and sky.
Go outside and take some time to observe anything that looks like the settings you want for backgrounds.
draw these settings to the best of your abilities even if in stick figure style.
Your real life observation will greatly enhance your work even as a stick figure movie.
You could use all sorts of colours based on reality to enhance colour selection.
The most important thing about colouring is that attention goes towards your characters.
The moving clouds in a few of the backgrounds was a nice touch.
I like the moving grass blades in the wind but it was sometimes distracting in places.
Limit moving clouds and grass blowing in the wind to slower parts.
The one shot of the stick figure standing perfectly still while grass blowing in the wind has a dramatic look to it.
simply some of your backgrounds a bit more to bring more attention towards your stick figures.
A mixture of light and dark colour will help make the characters standout.
It could be dark colours on background and lighter colours on characters.
It could be light colours on background and darker colours on characters.
Contrasting colors whenever appropriate will make a significant improvement on creating a more polishing looking cartoon.
Trust your own sense of taste with colour while trying to make your characters contrast against background.
If an object is far away use thinner outlines and less detail.
Keep a lot of your drawings simple until you become better at having control over those details.
I predict that your new work will be a lot better.
I hope my advice helps you become more successful.
I will come back and watch your new stuff.
Better luck in the future.
Keep drawing and stay motivated.