Black Mesa Invasion

In this map, you play as a HECU marine, sent to contain the alien invasion at Black Mesa research facility. Things get out of hand as your chopper get's shot down, and your squad gets in a battle with aliens. This map follows a "story". At the beginning, you will find an arrow telling you where to go. Keep going through multiple scenarios to finish the map. This is my biggest map yet, and I would really appreciate that you take a look at it, and maybe even give it a like so that I might make more maps. Incase you somehow didn't know, this map is based off Half-Life 1.