Alien Fighter Boy is described as ': Final World Hero is an action based 3D adventure game. The world has been conquered by hostile alien monsters originating from a nearby solar system' and is an app in the Development category. There are more than 10 alternatives to Alien Fighter Boy for a variety of platforms, including Windows, Android, iPhone, Android Tablet and Xbox. The best alternative is PUBG. It's not free, so if you're looking for a free alternative, you could try Fortnite Battle Royale or Apex Legends. Other great apps like Alien Fighter Boy are surviv.io (Free), Rules Of Survival (Free), Creative Destruction (Freemium) and H1Z1 (Freemium).
PLAYERUNKNOWN'S BATTLEGROUNDS aka PUBG is a multiplayer, first-person battle royal shooter set on a massive, 8x8 km island where players must fight to locate weapons and supplies to survive a battle and remain the last man standing.
Fortnite Battle Royale is a 100-player PvP mode in Fortnite: Save The World that is free to play. One giant map. A battle bus. Fortnite building skills and destructible environments combined with intense PvP combat. The last one standing wins.