Single-player games like Project:Sphere
Below are 8 single-player Steam games similar to Project:Sphere, 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 Project:Sphere page.
Ranked picks
- 1
NEON SPACE WAR
Single-player alternative to Project:Sphere — playable solo, no multiplayer required. Shares Action and Casual with Project:Sphere.
In NEON SPACE WAR you take control of a ship and defend yourself more and more enemies. Survive as long as you can. Collect points and unlock new upgrades. Control via mouse and keyboard.
- 2
LONE RUIN
Single-player alternative to Project:Sphere — playable solo, no multiplayer required. Shares Action and Indie with Project:Sphere.
Venture into an old, magical ruin to seek an ancient power in this highly replayable roguelike twin-stick shooter. Optimise spells and build ultimate combos to defeat twisted monstrosities and delve deeper into the Lone Ruin.
- 3
Orbit Breaker
Single-player alternative to Project:Sphere — playable solo, no multiplayer required. Shares Action and Casual with Project:Sphere.
Choose a geometric core, survive escalating waves with automatic weapons, and evolve matching weapons and passives into stronger builds. Explore sectors, find unlocks, and defeat the boss.
- 4
The Blue-G Interactive Vector Archive 77-97
Single-player alternative to Project:Sphere — playable solo, no multiplayer required. Shares Action and Indie with Project:Sphere.
Explore the rich vector arcade 'history' of Blue-G Interactive in this enhanced collection of 11 games. Made to run fast even on low spec hardware!
- 5
Nano.wars
Single-player alternative to Project:Sphere — playable solo, no multiplayer required. Shares Action and Indie with Project:Sphere.
WELCOME! To Nano.wars. A next gen procedual fps action game. Do you have what it takes to become the next Nano.wars Champion? Lets wait and see....
- 6
Big Trouble in Little Chimney
Single-player alternative to Project:Sphere — playable solo, no multiplayer required. Shares Action and Indie with Project:Sphere.
Krampus is Coming! Grab your Shotgun, finish your hot punch and don't forget your mission: Save the Christmas! Big Trouble in Little Chimney is highly-addictive and fast paced arena bullet-hell shooter.
- 7
Shoot & Neon
Single-player alternative to Project:Sphere — playable solo, no multiplayer required. Shares Action and Indie with Project:Sphere.
Survive, level up, and dominate the arena in Shoot & Neon, a fast-paced multiplayer FPS bursting with neon lights, endless waves, and powerful upgrades. Gear up for chaotic action!
- 8
Ozone Guardian
Single-player alternative to Project:Sphere — playable solo, no multiplayer required. Shares Action and Indie with Project:Sphere.
A new twist on the classic arcade shooter, with a variety of character choices and an upgrade system. Control your spaceship with your mouse & shoot with click - the only limitation is your hand speed! Face waves of creative enemy ships and stimulating bosses, and protect the ozone, Ozone Guardian.