Summary pulled directly from Steam - Some text may only be applicable to Steam platform

https://store.steampowered.com/app/2106670/Gatekeeper

• Get ready to embark on an epic quest to recover the stolen Heart of the Universe on two different planets across twelve challenging locations.

• With 4 unique and playable characters to choose from, you can customize your gameplay experience and play to your strengths.

• Each character offers a unique set of skills that can be upgraded through 45 different upgrades to help you on your journey.

• But beware! You will face fierce resistance from 20 different types of enemies, each with its own unique abilities and weapons that will challenge you at every turn.

• Join forces with friends to fight against the machines in co-op mode.

Join the battle to recover the Heart of the Universe and become the ultimate Gatekeeper!