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
Project NEUNLEBEN Alpha Defence Force
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
An attack by an alien species, emerging from a dimensional rift, has begun! Shoot 'em up your way through 11 levels with the help of the "Alpha Defence Force", consisting of three cybernetically enhanced cats, and defeat screen-sized bosses in this retro 16-bit-inspired Shmup.
- 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
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.
- 5
Celtreos
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
1-2 players, game controller support. NO in-app purchases. Over 45 minutes of music! 13 detailed stages, partly-random, with bosses. Tons of weapons, guards and special moves. Play in a window or in Full Screen.
- 6
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.
- 7
Apidya' Special
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
Apidya is making a comeback in this authentic 24-bit pixel remake, built from the ground up, but utterly faithful to the original.
- 8
Astral Bounty
Single-player alternative to Galactic Sentinels — playable solo, no multiplayer required. Shares Action with Galactic Sentinels.
Astral Bounty is a demanding 2D arcade side-scroller straight out of the ’90s. Blast through hand-built enemy waves, hunt four bounties, earn credits and blow them on beefy upgrades in the shop. You’re going to need them. 3 difficulty levels, 4 ships, mercy optional.