I can't say I approve of sticks...
...but can I resist when they are so action-packed?
Here's how I see it:
1. you have the load and play (btw, the text Loading is covered by the loading bar.)
2. sometimes your stickman's action defy not only gravity (as they should) but also logic (which they shouldn't...sometimes). Not sure what it is, but for some part their movement doesn't seem real.
Overall: I don't have much to critic about your stickmen. Their movement is fluid with the action-packed and the blood-splattering. Even the background looks good and that's a rarity these days on Newgrounds! I hope to see a completed stickman duke-out from you real soon bro!