Office Chaos Shooter is amazing concept where you join a company as an intern and your only job is to get promotion anyhow.
You have to beat up your colleagues by shooting them with a weapon provided to you. And you have to challenge your boss for promotion or else accept your resignation.
As you get promotion you will be given new weapons and new chair with different outfits. Decorate your character with different formal outfits,watch,shoes etc. Games has very easy controls and interesting gameplay.