Descent

Descent is an FPS roguelike concept demo with an arcade style. Progress through an infinite series of levels with increasing difficulty until you ultimately fall. 

Combat takes place on a circular platform acting as an arena that descends downward through a tower. Encounters can vary from a range of challenges as you descend, but generally involve eliminating a number of enemies. Fights are completed by eliminating all enemies or surviving for a set amount of time. Players get more powerful as they descend, collecting better weapons and upgrading their stats. After completing a level, the player is offered a choice of rewards that will increase their potency in some manner, in order to face the more difficult challenges that await below.