Crow flight

Upon casting, the user leans forward and spins into a flurry of feathers, before turning into a crow and flying either

Up to 2D20 feet, with the ability to stop at any point along the flight

OR

3D20 feet, but they must travel the full distance (of they want to travel 20 feet but till a 10, 20 and 5 they must travel the full 35 feet)

You can fly in any direction, but it must be in a straight line, and cannot go through walls or any go that a tiny creature could not fit through. range increases by 1D20 per spell level, up to 9D20 (max 180 feet)