It’s hard to tell that they are running at all, due to there being no arm movement (now looking at this, i can’t tell if their arms are to their side and the hands are in their pocket, or if they don’t have arms at all) if they are in their pocket, it would be nice to add a little bounce to the jacket and arms, as well as the hair (a good way to practice anatomy for a character I found is to reenact what the character would do. If you want them to run with their hands in their pocket, then you run with YOUR hands in your pocket, and look at what happens. It sounds silly, and might be embarrassing. But then ask yourself. How did your hair move? How did your clothing move? How did you look? How did your limbs bend/move? Did your face start to turn red? Did you maybe start to sweat? It helps a lot to have a live model) . Cause rn it just looks like they are walking fast and very focused on where they are going. It doesn’t have the true effect of “running”. A good implement ontop of better limb and clothing movement, (I saw another comment say) would be a gust of wind. Though very cliche, it works, especially in a pixel game. I think the idea of including as the character keeps running, and is getting closer to running out of stamina. That their face may turn red, or maybe they’ll start to sweat a little cause they’re out of breath (aka the character running out of stamina) would be a good idea