Games like TimeShifters

"Prodeus" is a horror-themed shooter game with great gameplay and graphics, a sensational soundtrack, and plenty of humor. It features a hand-crafted campaign, co-op and multiplayer modes, a level editor, and a community map browser. The game combines modern rendering techniques with retro aesthetics for a unique visual experience, and offers fast-paced, non-stop action against the Prodeans and forces of Chaos. Overall, it's a highly emotional and fantastic game with great replayability.

"Earthfall is a Science Fiction Shooter game with single-player and multiplayer co-op modes for up to 4 players. Battle an extraterrestrial invasion in the Pacific Northwest using futuristic weaponry and deployable barricades. Experience tense, procedurally generated gameplay and a well-crafted story across 15 levels."

"Wrack is a comedy-styled, single-player shooter game known for its excellent gameplay, stunning visuals, and catchy music. Build up long kill chains to unleash powerful chain finishers, and take down brutal bosses in the vein of Mega Man. Extra modes, Steam Workshop integration, and replayability via Time Attack and Score Attack round out this addictive package."

CLEARED HOT is a physics-based helicopter shooter featuring tactical squad control and creative combat. Use your rope and magnet to pick up objects, throw enemies, redirect missiles, and manipulate the environment to complete objectives. Strategically move your squad to capture territory or defend your base in dynamic, emergent gameplay.

"Hardcore Mecha" is a 2D side-scrolling action game with mech combat. Players can customize their mechas with various weapons and abilities, and engage in intense battles in single-player campaign or multiplayer modes. The game features a thrilling story of war, camaraderie, and betrayal in a world on the brink of collapse. However, the game has been criticized for its steep learning curve and lack of tutorials.

The co-op survival FPS and spiritual successor to the award-winning occult horror, Maid of Sker. Play solo or up to 4 players to survive the supernatural onslaught of the Quiet Ones.

"The Spy Who Shot Me™" is an arcade-style first-person shooter game that offers comedy spoof fun. As super spy Agent7, players must combat hordes of enemies across 16 levels to defeat the evil S.C.U.M. The game features retro-style pointy polygons and requires players to test top-secret software in a high-intensity spy adventure. Downloads are adware, virus, and spam-free.

"Ex-Zodiac" is a single-player Science Fiction Shooter game with a fabulous story and awesome gameplay, featuring 8 main levels and 6 bonus levels, major bosses at the end of each level, and a 16-bit style soundtrack. The game boasts exceptional visuals in a retro, colorful, low-poly style and encourages replayability with re-mappable controls. Join the Discord community for updates and feedback on the existing 2-level demo.

Military Conflict: Vietnam is a tactical shooter game set during the Vietnam War. The game features a variety of weapons and vehicles from the era, and allows players to engage in large-scale battles in a variety of environments. Players can choose to fight on either the US or Viet Cong side, and must use strategy and teamwork to complete objectives and emerge victorious.

"Nightmare of Decay" is a first-person action horror game set in a nightmarish manor, where you must fight for survival after awakening trapped inside. Explore an expansive, multi-level manor and face various enemies including zombies and cultists, with limited resources creating a more hardcore survival experience. The goal is to escape the nightmare, or die trying. Note: The above summary is based on the game's self-description and my knowledge cut-off of 2021-09. For the most accurate and up-to-date information, it is recommended to visit the game's Steam page or the official website.