Cat Souls is an indie 2D platformer where players control Ruby, a cat capable of using past souls as platforms. The game comprises 45 levels spread across 6 distinct worlds, each presenting unique obstacles and enemies. Ruby must navigate these environments, utilizing levers and collecting keys to progress, while managing her limited lives against hazards like spikes.

A core mechanic involves the use of souls to create platforms, adding a strategic layer to Ruby's traversal. The game features a cute pixel art style.