I was involved in designing and coding Echo, my team's entry for the Ludum Dare 39 game jam. The theme was "Running out of power". 

We created a Bastion (Supergiant Games) inspired game where the main character runs out of power as they use their abilities. When the player destroys the shadow enemies, they drop orbs of power which when collected, restores some of the players power, otherwise it slowly regenerates over time. 

Play it here: https://swav-gav.itch.io/echo