I'm sorry but as far as difficulty goes, this is by far the easiest RW game. I could fly forever on the final boss and i got hit once because of no need for aiming. Plus you get three hits before you get sent back to death row so imo still great game but bleedingly easy
Alright important strategy tip for the stage right before the "boss" you can trigger the little proximity mines without getting hurt if you're fast enough
 "Boss Battle"){kind=icon}
 "Frantic 2"){kind=icon}
 "Bullet Heaven"){kind=icon}
 "Robot Wants Ice Cream"){kind=icon}
 "Shadow Snake"){kind=icon}
 "Learn to Fly"){kind=icon}