Single-player games like Signal Zero
Below are 8 single-player Steam games similar to Signal Zero, 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 Signal Zero page.
Ranked picks
- 1
Cluster - Roguelike Tower Defense
Single-player alternative to Signal Zero — playable solo, no multiplayer required. Shares Action and Indie with Signal Zero.
A roguelike tower defense game where you strengthen your single tower through a tactical cluster board. Rotate, connect, and optimize cluster cards between waves, survive 30 waves, and take on Hardcore Endless mode with online leaderboards. Will you be able to keep up with the best?
- 2
Out A Space
Single-player alternative to Signal Zero — playable solo, no multiplayer required. Shares Action with Signal Zero.
Out A Space is a fast-paced, top-down space roguelike combining arcade action with tactical fleet management. Deploy your fleet on a pre-battle grid, customize ship loadouts, and chain weapon effects to shatter enemy armadas from your flagship as you cross the galaxy to uncover an ancient secret.
- 3
Curse of Deflection
Single-player alternative to Signal Zero — playable solo, no multiplayer required. Shares Action and Indie with Signal Zero.
Curse of Deflection is an action roguelike where you bounce through a dungeon. Hit enemies with your weapons but watch out for where your trajectory leads next. Choose an adventurer and enter the dungeon to find loot and powerful weapons. Choose your build carefully because death comes at you fast.
- 4
Astrum Vanguard
Single-player alternative to Signal Zero — playable solo, no multiplayer required. Shares Action and Indie with Signal Zero.
In Astrum Vanguard, a 2D horde-survival with bullet hell components, you pilot and upgrade your spaceship to defeat countless alien creatures. Survive the endless onslaught in the cosmic battlefield!
- 5
Null Orbit
Single-player alternative to Signal Zero — playable solo, no multiplayer required. Shares Action with Signal Zero.
Put together experimental weaponry to fill the screen with bullets and defend yourself from endless waves of foes
- 6
Cosmic Mart
Single-player alternative to Signal Zero — playable solo, no multiplayer required. Shares Action and Indie with Signal Zero.
Step into Cosmic Mart, the space supermarket where the deal of the day is certain death. Wipe out the relentless alien infestation devouring the facility in this frantic action roguelike. Choose your mercenary and survive long enough to reach the sixth floor.
- 7
Drone Break
Single-player alternative to Signal Zero — playable solo, no multiplayer required. Shares Action and Indie with Signal Zero.
Run and Gun Roguelite where the goal is to upgrade each consecutive alien drone on death so the next can strive to become overpowered enough to escape the all consuming hive mind.
- 8
Galactic Mecha GunSuit
Single-player alternative to Signal Zero — playable solo, no multiplayer required. Shares Action and Indie with Signal Zero.
A linear danmaku shoot-em-up with some visual novel elements. Clear 6 stages across 4 difficult settings, each with unique enemy spawns, bullet patterns and boss phases. The game is structured to have each difficulty cleared in sequence, with the full plot unfolding across each one.