You are Professor Von Pixelbaum.

One day, while working in the seismic laboratory, there is a calamitous quake. You must go deeper AND DEEPER to destroy the monsters that have been unleashed upon the world.

Use W&D/arrow keys and Left Shift for jump, or a standard controller.

Jump on monsters to kill them. Lava is hot and hurts! Slime is slippery and hurts!