House of Dead Ninjas

Game description:

What's a ninja to do when he finds himself at the top of an infinitely tall tower filled with deadly enemies? Jump, stab, bomb, and make "HIYA!" sounds in this challenging platformer that pits you against endless floors of enemies and a ticking clock. The randomly generated tower is different every time you play, so bring your skill and speed and dive as deep as you can before the House of Dead Ninjas claims your little ninja soul.

Game controls:

Arrow keys to move. X to attack. C to bomb.