@redback97 the name of each song is written on the same screen that you can choose the level you are going to play. Anyway the songs are EON - Popcorn Remix, ParagonX9 - Chaoz Fantasy and ParagonX9 - Final Fight.
20x Godlike Combo - Finish the game first. I think it is much easier to do it on Darwin mode. Get all enemies on the same side. Use charge (-> -> space) to push them to the edge of the screen, you should get combo 18x or plus. When you reach the edge teleport (-> -> shift) yourself to the same side you are, that will make you disappear and appear in the same spot and right after use attackjump (-> V space), then use stunt attack ( space) and finally use slam (V V space).
 "Papa's Burgeria"){kind=icon}
 "Doodle Devil"){kind=icon}
 "Death Vegas"){kind=icon}
 "Typing Ninja Hunter"){kind=icon}
 "Dolphin Olympics 2"){kind=icon}
 "Mastermind: World Conquerer"){kind=icon}
 "Bubble Tanks Tower Defense"){kind=icon}
 "P.O.D."){kind=icon}
 "Oroboros"){kind=icon}
 "Pwong 2"){kind=icon}
 "Mud and Blood 2"){kind=icon}
 "Agony: The Portal"){kind=icon}
 "Ragdoll Invaders"){kind=icon}
 "Fantasy Kommander"){kind=icon}
 "Pixel Purge"){kind=icon}
 "Meat Boy"){kind=icon}
 "Papa's Pizzeria"){kind=icon}
 "Reincarnation: Let The Evil Times Roll"){kind=icon}
 "Starfighter: Disputed Galaxy"){kind=icon}
 "Gamma Bros"){kind=tracking}