Games like Delta Squared 2

Delta Squared is an abstract Shoot'em up game made in retro 8-bit style in modern times. Has 4 stages, 2 game campaign modes and a local coop mode. Also has unlockable color palettes.

"Titan Attacks!" is a classic arcade-style shoot 'em up game with modern features. Protect your planet from hordes of invading aliens, using a variety of upgradable weapons and power-ups. Experience the thrill of survival as you battle through increasingly difficult levels, with boss fights at the end of each stage. The game features retro pixel art graphics and a chiptune soundtrack that heightens the nostalgic feel.

Lil Tanks is an action-packed, side-scrolling shooter that puts you in control of a prototype tank -- defending humanity from the alien scourge known as The Cuur. As Earth's last hope, you must upgrade your tank with unique power-ups and blast the aliens back to where they came from! Level up by destroying The Cuur and earn powerful permanent upgrades. Unlock multiple tanks by completing objective…

"Over 9000 Zombies!" is a frenetic first-person shooter where players must survive waves of zombies in various maps. Utilize a wide range of weapons, from pistols to grenade launchers, to annihilate the undead hordes and progress through the game's challenges. With online co-op mode, team up with friends to exterminate the zombie menace together. Fight for survival and prove your mettle against over 9000 zombies!

"METAL SLUG 2" is the second game in the run-and-gun action shooting series, now available on iPhone/iPod Touch. This port includes both Arcade Mode and Mission Mode, allowing you to play specific stages. The game features new playable characters, weapons, and slugs to help you thwart General Morden's evil ambitions.

Blast through random levels of enemies with or against up to 3 of your friends in this action roguelike top-down shooter! Travel from the desert to the enemy base and...into space!? Upgrade with quicker firing, bouncing bullets, and more. Defeat huge bosses to unlock more tank classes! Co-op Campaign Defeat every enemy in 20 randomly selected rooms from a list of 54 hand-crafted levels. After de…

"Batsugun is an action-packed shoot-'em-up game with local multi-player for up to 2 players in co-op or single-player mode. Choose from six unique pilots and three ship types, and immerse yourself in a world of vibrant graphics, intense firepower, and a captivating soundtrack. The rebalanced Batsugun Special features updated visuals, new enemy behaviors, and increased difficulty across multiple loops, providing a challenging and exhilarating experience for both newcomers and seasoned players."

"Raiden Legacy" is a four-title compilation of classic scrolling arcade shooter games, where players control the Raiden Supersonic Attack Fighter to repel an alien invasion in 2090. The game offers Training, Arcade, and Mission modes, with over 15 ships to choose from, each with unique stats, weaponry, and special attacks. Players can enjoy the game solo or with a local/online second player.

Assault Android Cactus is a vibrant, arcade-style shooter where players control android heroes fighting against waves of robotic enemies. With a variety of distinctive characters, each with unique weapons and abilities, the game offers a dynamic and engaging experience. The game features a campaign mode with high replay value, as well as local co-op for up to four players, making it a great choice for fans of frantic, action-packed gameplay.

"The Joylancer: Legendary Motor Knight is an early access game with a planned 2021 release, currently running on a new engine for improved stability. Players control a motorized lancer in a sidescrolling adventure, with updates and improvements planned for the final release. The game can be purchased on itch.io and will grant a free Steam key."