Here are some cheats and tips for the game Eos: Edge of Skyhigh.
Level select:
Pause game play, hold L1 + L2 + R1 + R2, and press Triangle, Square, Right,
Down, Left, Up.
Invincibility:
Pause game play and press Up(2), Right(2), Down(2), Left(2), Square,
Triangle, Square, Triangle.