Vib Ribbon [PSOne Books]

The player controls Vibri, a vector drawn rabbit who skips along the music track's timeline. If obstacles are hit, Vibri will degenerate into a frog, then a worm before the player fails a level. Each time the player hits an obstacle, the level begins to shake incrementally until the character degenerates, making the course harder to navigate. Avoiding obstacles with precision will cause Vibri to evolve into an angel like state, which increases the player's score.