Sector 781 is a Metroidvania platform game with a classic pixel art design. There are 3 realms to explore, each consisting of 25 screens that function as mini-levels. Players must explore this space station environment to collect upgrades, so that their astronaut can find and defeat the final boss of each realm. Players can use the computer consoles to save their progress, and collect green pips to refill the astronaut’s health bar. There are 6 power-ups to collect and 7 types of enemies to defeat.