Here is an overview of the game, via its Steam page:

About

Inkbound is a co-op roguelike RPG that brings the best aspects of Shiny Shoe’s award-winning title, Monster Train, to a world where stories come to life. An unknown force begins to unbind these stories and the worlds they create. It’s up to you and your friends to protect them.

Key Features

• Write Your Own Destiny – Discover the magical Atheneum and the infinite worlds contained within to protect it and become the fabled Inkbound. Or break free from your station and unravel the real story behind your creation.
• Fight For Your Story – Arm yourself with the brute strength of a Magma Miner or the swift attacks of a Mosscloak to survive. Embark on procedurally generated runs and weigh the risks of one path versus the potential rewards of others. Choose wisely, your survival depends on it.
• Create Your Style – From a hat shaped like an astronaut cat to bat wings, unlock new amazing items with each run. Fight through rich, atmospheric worlds with outfits that will be sure to impress your fellow warriors!
• A Living Game – Experience a gripping story and combat that changes monthly, weekly, even daily! A living game, no two days are the same in the expanding world of Inkbound.
• Enhance Your Power – Learn exciting ability Bindings, choose powerful forgotten Memories, and equip loot from legends to become the Inkbound hero no one thought you could be. And a bonus feature you loved in Monster Train: discover hundreds of character builds by mixing and matching classes.

Watch the announcement trailer below.