Single-player games like Replicators Defence
Below are 8 single-player Steam games similar to Replicators Defence, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Replicators Defence page.
Ranked picks
- 1
Among the Skies
Single-player alternative to Replicators Defence — playable solo, no multiplayer required. Shares Action and Indie with Replicators Defence.
Among the Skies is an naval-style game based around medieval airships built like castles. The goal is to construct a base, build an airship, and conquer territory.
- 2
Astronaut Assault
Single-player alternative to Replicators Defence — playable solo, no multiplayer required. Shares Action and Indie with Replicators Defence.
Dive into Astronaut Assault, a third-person Sci-Fi tower defense game, and battle against relentless enemy waves in diverse arena settings. Arm yourself with an array of turrets, traps, and gadgets to halt, hinder, and outmaneuver your foes.
- 3
Happy Z-Day
Single-player alternative to Replicators Defence — playable solo, no multiplayer required. Shares Action and Indie with Replicators Defence.
Today is supposed to be your daughter's birthday, But something happened in this town. Almost everyone has turn into a Monster. You need to protect your daughter and her birthday party!
- 4
Red Planet Rampart
Single-player alternative to Replicators Defence — playable solo, no multiplayer required. Shares Indie with Replicators Defence.
You are deployed to the desolate red planet to reforge humanity's hope. With no hospitable atmosphere, no nurturing water sources, only relentless storms, unknown alien creatures, you must use wit and determination to survive on this alien land and build a Mars base of your own.
- 5
Blood Waves
Single-player alternative to Replicators Defence — playable solo, no multiplayer required. Shares Action and Indie with Replicators Defence.
Hardcore and bloody shooter where you will have to repel the attacks of the living dead using the destroying traps, defensive barricades and also weapon of close and long-range combat.
- 6
Strike Suit Zero
Single-player alternative to Replicators Defence — playable solo, no multiplayer required. Shares Action and Indie with Replicators Defence.
Pilot the mecha Strike Suit across massive fleet battles where your dogfighting skills decide Earth's fate. Fast, frantic space combat with capital ship destruction, multiple endings, and a universe that's anything but empty. This is space combat reborn.
- 7
rymdkapsel
Single-player alternative to Replicators Defence — playable solo, no multiplayer required. Shares Indie with Replicators Defence.
Build a space station. Command the tiny crew. Explore the galaxy. A meditative space strategy game.
- 8
Mars or Die!
Single-player alternative to Replicators Defence — playable solo, no multiplayer required. Shares Action and Indie with Replicators Defence.
Control two characters simultaneously! Survive, gather, collect upgrades, fight all sizes of one-eyed Martians, build defensible outposts and conquer Mars, in this glorious mix between roguelite and tower defense.