Similar games
A retro-inspired tower defense game for PC where smart placement and planning of defenses is the core. The presentation is deliberately simple and nostalgic.
What defines System Protocol One:
The closest matches for System Protocol One are Ancient Planet, Sentinel and Nuke Them All. Each of these 10 games shares something of what makes System Protocol One special – the reasons are listed right on each game.
91 %
Best match
An indie sci-fi strategy game where you defend an ancient bastion against invading alien armies using powerful ancient technology.
91 %
Tactical depth
A tower defense game played on a sequencer-style grid where every defense you place and every enemy you destroy shapes the music in real time. Strategy and sound blend across 31 levels.
90 % 9.75 €
Focus on a single character
An old-school indie real-time strategy game in a sci-fi setting: capture flags, take territory, destroy the enemy fort and finish it all off with nukes. Made by a devoted fan for lovers of the classic genre.
89 % −10 %Tactical depth
Facrobry is a strategy simulator where you run an automated robot factory, research upgrades, and send your assembled robots into battle. The appeal likely lies in optimizing production.
89 %
Tactical depth
A sci-fi tower defense game where collectible cards let you burn, poison, freeze and blow up waves of droids to defend your base and flags.
89 %
Tactical depth
A minimalist real-time strategy game where you send swarms of ships between planets to conquer the galaxy. The 23-level campaign teaches the basics, while higher difficulty levels demand real tactical skill.
89 % 4.99 €
Tactical depth
A retro-styled tower defense where you build mazes and place towers to keep alien hordes away from the Core. Active abilities like Air Strike and Freeze add extra dynamism to the battles.
88 % 11.79 €
Focus on a single character
An accessible indie sci-fi strategy game about attacking and defending planets. Simple controls make it easy to pick up, while the gameplay offers more depth than it first appears.
88 % 9.75 €
Tactical depth
A tower defense game set inside the human body, where you fend off waves of viruses and bacteria using units modeled on real anatomy.
87 % 4.99 €
Tactical depth
A 2D real-time strategy game with a pixel art look, recalling Total Annihilation with huge armies of tanks, ships and aircraft. It focuses on base building, resource management and cooperative or competitive skirmishes.