Two things to bring up, a suggestion and a bug report. The suggestion is to make the player deal more damage punching during a dash and the bug report is that punching legs appears to have a small chance to teleport the player through the ground.
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Suggestions #2, #3, and #4. #2 is to have the melee enemies if shot in the upper torso instinctively cover their head, #3 is to make a small flying enemy that can follow the player to places the others cannot reach, and #4 is an enemy which will switch between a ranged and melee option, opting for ranged unless the player actively gets close then switching to it's melee option.