Games like Plasma Protocol

Kill aliens and buy upgrades in a similar sci-fi setting.

Battle massive alien forces with a wide variety of heavy weaponry.

Fight off alien invaders in a high-tech sci-fi sandbox.

Defend against alien destruction using advanced technology.

Engage in intense, cinematic sci-fi combat with weapon upgrades.

Defend against alien threats in a massive co-op setting.

Classic sci-fi shooter featuring intense combat and exploration.

Military-focused sci-fi action with unique alien opponents.

Hunt or be hunted in a gritty sci-fi horror setting.

Fight for survival on Mars against a dangerous environment.

Fast-paced retro shooter involving security breaches and futuristic tech.

Rack up high scores by triggering chain reactions in arcade combat.