Simply finishing a level doesn't guarantee a high score. Focus on collecting as many dots (pellets) and coins as possible.
After 1,500 meters, the game introduces "Mask Fatigue." Your temporary power-ups (Yellow Mask for enemies, Blue Mask for walls) last exactly 1.3 seconds less per acquisition. In the Top Vaz bracket (2,500m+), a Yellow Mask lasts barely 0.4 seconds, requiring near-superhuman reaction times. tomb of the mask top vaz