There's a hallway, and there are aliens in it.
Alien Hallway is a strategy game developed by Sigma Team (the makers of the Alien Shooter games). Your task is to command a squad of Space Marines to fight to the other end of the hallway—which is, of course, filled with aliens—and destroy the aliens' base before they can do the same to you.
This game contains examples of:
- 100% Completion: Getting five stars on every level earns you a Steam achievement.
- Alien Invasion: The first planet you have to defend is Earth.
- Cooldown: Represented by a greyed-out section on the icon that gradually drains away. You can purchase an upgrade to reduce the cooldown times.
- Elite Mooks
- Energy Weapon: The weapon of choice for the strongest unit.
- Every Bullet Is a Tracer
- Excuse Plot: The plot, in a nutshell, is "Aliens are bad. Shoot them."
- Fire-Breathing Weapon: Your basic Flamethrower unit.
- Gameplay Grading: Your performance on each level is rated from 1-5 stars, and you get more money for higher ratings. There's also an achievement for getting five stars on every level.
- Giant Mook: In the later levels, some of the aliens have Mini Mechas to tower over the battlefield.
- The Greys: The aliens.
- Mini-Mecha: Worn by the Giant Mooks on the third planet.
- Mooks: Armies of alien mooks.
- RPG Elements: You earn gold for completing missions, and you can spend it on upgrades.
- Secondary Fire: The flamethrower, shotgun, machine gun, and laser gun units can all throw grenades as well; a grenade icon pops over their head when it's available. A variant of the trope, in that the regular attack is automated, and only the secondary fire has to be manually activated.
- Space Marines
- Suicidal Overconfidence: The AI's job is to advance toward you at all costs, even if they're hopelessly outgunned.
- Suicide Attack: One variety of mook is an alien with a bomb who runs toward your guys and blows himself up.
- Worker Unit: Engineers, whose job is to gather energy so you can create more units.