BACK FROM THE DEAD, MOTHERFUCKERS!
Oom: A video game that's all about explosions. Melee weapons? You have a exploding power fist that causes your enemies to turn into chunks of burning gore in one hit. Guns? You have a rocket launcher/grenade launcher/flamethrower/mine layer combo that allows you to pull off all sorta crazy shit. Using this, you fight your way through sentient explosions from the 5th dimensional flesh plane and the poor fools possessed by them.
Alo: Say hello to all the friendly aliens, then brutally murder them with your sonic powers. Split their brain open with a piercing sonic scream, smack them with the powerful Boom Hammer that sends them flying into the air and put them down with the Bass Cannon.
Atred: A game about filing your taxes and being a upstanding citizen. The upgrade system is in the form of the Altruism mechanic, which rewards you for going out of your way to help others no matter the risk to yourself.