Animation is smooth

For a first I think I like it

It's clear this is new to you, so I'll try and give some tips.
* Try and move the camera smoothly if you can; get a nice, even pan from point to point, so that it's easy to track the stick figure visually.
* Your slow movements look decent, but fast stuff (especially running) looks bad. Take a look at some walking and running cycles online and try to model your animation based off of this. Walking and running are boring to animate, so you may consider using a loop for this.
* If you can, try to make your animation too slow at first. Only then do you begin to remove some frames to speed it back up again. This ensures that each movement is meticulously drawn, and not just a slop from point A to point B.