Kill the Plumber

More levels bigger game on Steam
http://store.steampowered.com/app/420070/

Kill the Plumber is unique platformer game where you play as the enemies instead of the hero. There are puzzles, timed survivals, and boss fights where you play as the boss. That’s right! Play as flying Big Ghost and King Bowler who unleash devastating fireballs and stomps!
Instructions
WASD or Arrow Keys