pretty good tester
I would suggest that the character needs friction (couldn't tell you how to do this though) but it reminds me of the old scooby doo cartoons where the character and backdrops weren't connected to one another.. your guy keeps moving when he's in contact with the ground looks like he's sliding.. except you can tell he's not supposed to be cos when you stop he stops
otherwise he's a cool looking guy with nice punch animation
keep it up you have a cool art style and I should think any games you eventually make will be popular around these parts