I had some difficulty figuring out the controls. Just pressing 'N' and 'M' seems to shoot the ball down into you. Holding down 'v' while pressing 'N' and 'M' gave me much better results.
I like how punchy (lol) the punches feel. There's a nice feel of power with the block shaking.
It seems like the ball can just fall through your middle and there's very little you can do about it (This is also the case in action pinball, but the gap is much smaller).
My two main suggestions would be to close off the launch chute after launch (ball falls back in a lot) and add some interesting hazards that manipulate the ball in various ways (similar to traditional pinball games).
One fun idea to add would be to have the ball damage you (leaning in to the fighting aspect) upon collision - you lose when you run out of health. Add blocks to defend and have attacks affect the ball differently (straight punch could just launch the ball, hooks could add a spin so it would curve, etc.).