It's okay
The thing that I like best about this is the art style, very nice. Other than that, the punching has a weird feel to it. Maybe instead of being able to hold the button down to punch, let us be able to tap the button and decrease delay between punches? This may be a little nitpicky but I'm not a big fan of the movement. If you just tap the left or right arrow, you can see that the movement is a slide followed by a jump, maybe it should just be a jump in the direction pressed with perhaps a slide at the end since the bag has no feet.