Milk Megami Marielle is a sidescrolling action game with adult content.
One day, Marielle is out in the woods when a witch strikes her with a curse, her boobs swell and produce milk. Now she must fight to stop a nefarious sweets making company from using her as a milk slave.

Simple linear platformer, Marielle has a simple set of moves in her arsenal. She can throw fire with her fists and Uppercut enemies for massive damage, but she needs to be careful not to get grabbed by them.
Source: DLsite