The game features a campaign mode where difficulty increases as you progress across the solar system, and a sandbox mode where any of the last 5,000 ship designs can be tested out. Controls use the WASD keys to move and the spacebar to shoot, with the mouse reserved for ship design. Parts, such as bulkheads, abilities, weapons, and engines, can be easily joined together to create an innumerable variety of space-faring vessels. Designs can be improved on the fly or after finishing a level; the custom ship design mechanics are both enjoyable and strategic. Procedurally generated enemy ships also add an immense amount of replay value, each requiring different tactics to destroy the cockpit without harming items that could be incorporated into your design. Captain Forever Remix is an extremely difficult, unforgiving game, but high replay value and a distinctive theme make it a notable roguelike.