Top similar games like Bill's adventure: Alien war:

Sci-fi 2D shooter platformer combining the control of a human character and an armored vehicle on the surface of a planet filled with robots and immortal local inhabitants

A little round robot is on a mission to save Earth. Lead your crew into exploring different planets in search of resources, killing enemy robots, collecting different power-ups and upgrading your powers, while solving the mysteries of these planets.

Way In The Stars is a real adventure! Find the reasons for the disaster, save the ecosystem of the planet and colonists, and start your own way amongst the stars!

Sentinel Attack will have you play as both Justin and Erica in horizontal shooter and metroidvania stages as you battle in space and explore the many levels of the Sentinel station.

"Havoc Runner" is a futuristic action and 2D platform game that will take you to Titan's moon to face killers robots, missile launchers, and automated weapons in a hostile environment where you must find and destroy the Tupan computer, preventing a missile attack on the planets of the solar system.

Explore and uncover the mystery of this enormous spaceship by shooting alien creatures in this Sci-Fi Action/Adventure Metroidvania.

Forge your own path through a derelict station in this fast-paced epic adventure. Navigate the labyrinthine behemoth, form alliances with survivors, and uncover the secrets behind the mystery that befell this place.

You do not know anything, yet you have to move forward. Wander through the corridors of a mysterious factory and recover your abilities. Fight patroling drones and break through to demanding boss battles. Seek a way out and find the meaning of the game's title.

So you know that one rover that landed on Mars? Yeah this isn't that.

G WARRIOR is a retro hardcore action shooting game. Pick up the gun and destroy all robots and aliens. Fight in colorful scenes such as snowy mountains, caves, seas of fire, alien lairs, etc.! !

Code Arcturus is a retro inspired arcade-style action platformer, with aliens, robots, spikes, explosions, and lots of coins. Blast your way through levels, compete for the fastest times on the leaderboards in Speedrun mode, or put your skills to the ultimate test in Nerfed mode

A game designed with the intend of speed running as the player you must fight monsters and robots and make your way through four stages and defeat all the bosses and make it to the end portal as quickly as possible

Super Artificial Intelligence PSIKE is a 2D platformer Action game. The Epic story is about an A.I who want to be a human and a man who does not want A.I . Speedy Action part, cool visual novel part and cinematic cut scene will take you to a future world.

Jett Rider is an arcade shooter packed with action, exploration, RPG elements, tons of humor and awesome bosses. Explore, fight, gain experience, purchase weapons in this exciting adventure.

Far Star is a story-driven action-adventure game with Metroidvania influences. There is something fishy going on in this galaxy, but this won’t stop your intergalactic general services crew from doing their job using a varied set of skills, weapons and outfits.

A Sci-fi Shooter with Pixel-art graphics and various mechanics such as slow motion and dashing. In some levels you also get a special assistant.. You will enjoy this space shooter game. make sure you ALWAYS KILL THEM ALL.

With the power of gravity manipulation and bubblegum, the Bubblegum Bandit wreaks havoc and takes revenge! Steal from evil robots and blow up their ships!

The World of RUINWAKER is filled with lost treasures and trinkets to find. Explore as Grant Gavis, a novice member of A.R.C.H.S. ( Otherwise known as the Archeological Recording of Cosmic History Society. ) Can he prevent an ancient power that he's uncovered from falling into the wrong hands?

Destroy enemies, bosses and everything you see ahead!! Get crystals to buy better starships and get stronger. Have fun in three different game modes.

O.M.S is a casual story-driven 2D Sci-Fi Platformer where you control L10 as his world is threatened by SIMPHONY the very AI that powers his planet. L10 will be avoiding dangerous obstacles and enemies as he hopes to repair SIMPHONY and save his world.

Xeno Shooter is a action shooter arena game! You play as a space cadet who travels to Andromeda with the mission of defeating the Primordials and thus, achieving a new home for humanity.

Inspired by old NES games, Ragnar is a 2D run-and-gun action platformer that will be difficulty and fair. We would like to bring back the classic and retro feel to modern platforms and a new generation of gamers.

A pixel-art platformer adventure game with lots of action and a memorable story.Dive into the depths of planet Anyaroth and free its people from the tyranny of the Queen. Join the Rebellion and fight against the Regime’s mind-control system. The anya civilization needs you!

Journey to the center of the planet in Piroot, an open world adventure! Explore and survive as a shipwreck's lonely survivor. What secrets lie at the planet's core, and can you trust the voice leading you there?

An SNES-Inspired, platforming, sci-fi adventure. It's like playing a Saturday Morning Cartoon!

Zack Y is a 2D Old School Scifi themed platform action game based on the story of the Alien called Zack Y whose mission is to rule over the Earth.

Antrio is a 2D action-platformer inspired by classic games from the 8 bit era. Shoot, drill, climb and fly to fight lots of enemies and overcome the challenges each level has to offer.

Discover an enigmatic universe. Explore diverse biomes, face ancient guardians, and uncover hidden secrets in this captivating 2D pixel art platformer. Embark on an unforgettable cosmic odyssey!

Play as Atrion, a hybrid stranded on an unknown planet. Explore strange landscapes, battle your adversaries, gather resources to repair your ship and unravel the mysteries of your lost identity. Face death, learn, and progress to dominate this unforgiving world.

Galacticon is a video game with the look and feel of arcade cabinet games from the early 80's in the style of Williams classics: "Defender" or "Joust", with the gameplay of legendary "Jetpac", and with touches of "puzzle".

Enjoy this 2D metroidvania-like bullet hell platformer. Jump, dodge and traverse using your jet pack. Find weapons and abilities. Fight bosses and escape an old space station drifting through the cosmos. You are alone, with nothing but a space suit and a gun. Just keep going! Persevere and triumph!

Gemaboy Zero X is an action, exploration, and platform Cyberpunk Ploidmania videogame. It is the latest installment in the PLOIDS saga in which Omega will have to travel through time to preserve it and rescue his beloved Alpha!

Become Aiden, a three-armed mutant who hunts the most dangerous bounties in the galaxy. Catch, slice, dice and destroy enemies in this exciting 2D platformer with a space-western setting.

キャラをじっくり育てながら広い世界を冒険する――。 そんなSTGの最終編。ショットを合成して、いいとこどりのショットも作れる！ シリーズ最強の敵たちに最強の武器やスキルの組み合わせで対抗し、 この物語の真実に辿り着いてください―

The Hero of Bangaona is a 2D Side-scrolling Action game where you play as the Hero of Bangaona kingdom whose mission is to capture the enemy bases in order to rescue the Princess who got kidnapped by the soldiers of the Weins Territory.