Activation on Steam.
Enter the Gungeon is a game similar to The Binding of Isaac and works on similar principles. Each room is randomly generated, so no two playthroughs are exactly the same. Enemies, items, weapons, and items in the shop are also random. A random boss awaits on each floor, and you can also encounter imprisoned or just wandering NPCs. After you free them, you can find them in the main hall. If you die, you start over on the first floor.
Souls-like game. Very hard!