Aliens

Laser Cannon 3 is a physics-based puzzler-shooter where it's up to you to clear each stage from annoying alien creatures using your mighty cannon with as less shots as possible.

Laser Cannon 3: Levels Pack is a physics-based puzzler-shooter where the objective is to shoot, squash, blow up and destroy all the monsters using ricochet shots, explosive barrels or other helpful stuff.

City Siege 4 - Alien Siege is a free online game that combines platform, shooting and strategy and is set on another planet, where you'll arm yourself with advanced units and laser guns and take on evil alien-plants.

Invaders War is a fixed shoot 'em up inspired by one of the first games ever created, Space Invaders. Defeat all aliens and win each level, advancing to accumulate as many points as possible!

Zillion 2: Tri Formation (1988) is a Master System run and gun 2D platformer based on the sci-fi anime series where JJ has to stop the Norsa from invading and rescue his teammates from a gigantic alien battle fortress.

Angry Heroes is a physics-based puzzler-shooter where you'll join our cute birds, once again, to destroy all aliens and save the world. Master the slingshot to take on the monsters!

Run Away 3 is an free running game where a little alien dude is astray and need to rush through space and explore the galaxy. He can never stop, otherwise it's game over!

Zombie Catcher Online is a cool game where you'll join the little green alien who was hired to capture all the zombies which escaped from the lab and throw them back to their cages.

Zillion is a Master System metroidvania-styled action-platformer from 1987. It's based on the anime and the same name and features an emphasis on exploration and problem-solving in an alien-controlled underground base.

Starship Defender is an endless, retro-styled and side-scrolling shooter where you must command your defend your space sector against an incoming alien invasion and prevent our scientists being abducted by their ships.

Eliatopia is a MMORPG where you'll explore the fantastic Eliatopia, a newly discovered planet inhabited by aliens. It seems something is rather strange on this world. Just make sure you have some good swords and armor...

Frontline is a cool game that combines old arcade classics such as Space Invader and Galaxian with a idle/merge gameplay style, lots of fighters and weapons, huge bosses and cool pick-ups to collect.

Super Billy Boy is a very cool and colorful platform game inspired on Super Mario Bros. where you'll embark on an adventure full of enemies and dangerous traps. Features pixel art graphics and retro style and is a lot of fun!

Doom Dr SciFi is an online FPS heavily inspired by the id Software's classic, but has simpler controls and mission: destroy the mechanized-armored slime aliens and explore a magic space maze.

Space Prison Escape 2 is a platform-puzzler where our heroes were surrounded them before they could get back to Earth and now must escape from a space prison by finding minerals and the door to the next level on each floor.