A puzzle 2D platformer of the heart, where you are a germ trying to make your way through to heart into the brain. Red cells (Blueish dots) are food and white cells ( Purple goo) try to stop you. The speed and tempo of the game increases according to the progress you make. Also, your surroundings are affected by the beating heart.
The ending might not be the ending you want, nor running out of bacteria isn't essentially a bad thing.
P.S. You don't die, but your bacteria gets converted into white cell among contact.