I'm having a hard timt trying to understand why jumping on an enemy doesn't make automatically jump. I get that you may want to keep going down to kill another enemy, but when falling for what seems to be a random amount of time and there aren't enought enemies it's just to risky to even try.
Since you can attack an enemy from any direction it would (imo) make no sense if the character would jump automatically after killing an enemy. I also think that it would restrict the player.
You can just jump just before you would kill the enemy if you do not want the enemy to boost you downwards.