Story of a Gladiator is an arena beat 'em up where you take the role of a man in search of his destiny. It's an indie action game produced and published by Brain Seal Ltd in 2019. Fight against waves of enemies in the arena to earn coin and fame until you are strong enough to enter the colosseum and become champion.
The system requirements are light; almost any modern computers will work for playing SoaG.
The RAM requirement of 4gb is easily covered.
Take account that at least 3gb of disk space is needed.