I agree with these guys
If you die in the Mario-Bowser fight, Bowser shouldn't go back to full health. It makes things too bloody difficult.
However, I do have a tip for picking up loads of points at one time. Knock an enemy into the air (don't care how), hold the up arrow key and press S everytime the enemy reaches your head. With good timing, you can 'juggle' an enemy in the air long after they are actually dead, and earn 8 points for every hit. This is a good way to build up points ready to lose them all in the Bowser fight (which is actually impossible)
So, yeah. This is a good game with only a few flaws. 4/5 8/10 and faved.