Harmful Park

Harmful Park was only released in Japan by a small company called Sky Think Systems for the Playstation. It's a normal 2D sidescrolling shooter, but set in a bizarre amusement park. As you learn in the (relatively long) introduction, an evil scientist has taken over Heartful Park and is using it for nefarious purposes. One of his colleagues wants to stop him, but she's too old to do it herself. So she orders her two slacker daughters to save the day and equips them with a flying motorcycle of sorts, armed to the teeth with strange weapons.