While it was originally sold for around $10 on Steam, Xbox Live Arcade, and the PlayStation Network, here is the current status of how to find it:
The game was widely criticized for being extremely short (taking about one hour to complete) and for its repetitive gameplay.
Battle: Los Angeles PL : Saber Interactive : Free Download, Borrow, and Streaming : Internet Archive. Internet Archive Battle Los Angeles Free Download
I remember having Battle Los Angeles game when I was younger. I remember it was an FPS game and followed the movie pretty closely. Reddit·r/xbox360
Battle: Los Angeles PL : Saber Interactive - Internet Archive While it was originally sold for around $10
A short tie-in to the 2011 movie where you play as Corporal Lee Imlay defending Los Angeles from an alien invasion.
No, there is no official "free-to-play" version of this game. Because it has been delisted, it is no longer available for direct purchase or free download from its original official storefronts. Battle: Los Angeles - Steam Community I remember it was an FPS game and
Battle: Los Angeles PL : Saber Interactive : Free Download, Borrow, and Streaming : Internet Archive. Internet Archive Battle: Los Angeles Review - GameSpot