No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. Reviews and prices only.

Exophobia

Exophobia is a retro-inspired first person shooter with fast-paced combat. You wake up to find yourself alone in a human spaceship infested with hostile alien soldiers. Explore your surroundings while you uncover piece by piece the backstory and destiny of its human inhabitants. Shoot, dash, stun your enemies and more, in your path to escape! KILL FPS action where fast reflexes and clever positioning are vital. Learn enemy behavior and use all your movement options and your surroundings to eliminate diverse groups of alien armies as fast as possible or before they kill you. EXPLORE Discover a labyrinthine spaceship with multiple floors and uncover the past events that led to this high-stakes moment. Get lost in hostile environments and traps while doing your best to survive. Be curious enough and you might find some secrets that will make you stronger. UPGRADE If you find a specialized room, you can improve your weapon with a new ability. These drastically change your combat tactics and will be used to open up previously inaccessible areas in the spaceship required to progress. DIE Ruthless difficulty with diverse combat situations with different enemy types and attack patterns, including menacing bosses. When you die, you respawn in the last visited checkpoint in the spaceship, so beware what you might find in the next room.