Last Keep is the developer of Fleetbreakers, an action RTS roguelite. The game’s Steam page credits the studio’s team as the creators behind Halo Wars and Age of Empires, and the project was shown publicly as Project Citadel before launch.

Fleetbreakers entered Early Access on 15 September 2026 through publisher Level Up Gaming and debuted as a new entry at #48 on Steam 250’s 7-day chart at 97% positive from 38 reviews.