Black and White is a puzzle platformer that sees you controlling two polar opposites. What one does, the other does in reverse. Can you get them to their exits?
Made by Justin Affray, there are similarities with the locally made Enough Marios (which in addition to being fun, is hilarious).
The two characters can hit switches for each other, and you'll find that the later levels demand you plan out every fateful jump beforehand, or be forced to restart.
The backgrounds can cause some visual mayhem, and certain blocks require both characters to touch them before allowing them through.
Just keep in mind the game doesn't save your progress, so don't close the window if you plan on continuing!