Single-player games like Galactic Sentinels
Below are 8 single-player Steam games similar to Galactic Sentinels, 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 Galactic Sentinels page.
Ranked picks
- 1
VectaGuard
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
Arcade-inspired shmup action where neon vector caverns explode with modern visuals, dynamic music, weapon upgrades and intense score chasing.
- 2
RESHOOTER
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
RESHOOTER offers heart-pounding shoot-em-up action that elevates classic arcade gameplay to the next level. Dive into the retroflow with electrifying visuals, immersive audio, and captivating mechanics.
- 3
Viral Reload EX
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
Viral Reload EX is a shoot-em-up with a dash mechanic where you shrink down to fight infections at a microscopic scale! Can you defeat the evil Kyle Kaboom before he destroys the moon?
- 4
Hellfish
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
Hellfish is a classic side-scrolling shoot 'em up set deep in a corrupted ocean. Battle demonic sea creatures as The Pope using his holy submarine, and customize your righteous weapons in unique ways every time you play.
- 5
Phase Nexus
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
Blitz enemies in slow motion as an energy-based speedster and stop time then fire off with precision as a warp speed teleporter in this space-time action! Phase Nexus is a cartoony character action game that stars a quarter alien and a cyborg vigilante fighting against reality-breaking anomalies.
- 6
VOIDRAVE
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
A bullet hell shmup with a secret. 100 waves, 20 bosses, and the slow realization that the sector you're purging isn't a sector. You are not crossing the void. You are inside it.
- 7
Imminence
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
A brutal 16-bit sci-fi shoot-’em-up inspired by the golden age of the Sega Genesis. Fight across multiple worlds, upgrade your ship, and confront the forces behind the Augmentation Program.
- 8
Space Mash
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
Space Mash is a bullet-hell shooter in the retro style of the earliest arcade games. To help beginners, older players and those with a motor impairment, there are five levels of slow-down that can be activated at any time during game play.