Operation Carnage

You play the Guardian, pitched into a deadly battle against the Alliance. Moving from room to room, you will have to fight your way into the heart of the alien dominion and destroy it.
Each room will be populated by a deadly assortment of Alliance forces. You will need to annihilate all enemies and completely clear the room of any danger. Only then will you be able to open the access doors that will lead you to the next room, deeper into Alliance territory.
The Alliance Empire is divided into distinct sectors. Each sector is more deadly than the last. At the end of each sector you will encounter an Alliance Master, which will guard the entry into the next sector.
These terrifying creatures and cyborgs come in all shapes and sizes, but they all have a common goal: to stop you, destroy you and prevent you from reaching the next sector. You will have to overcome these awesome foes if you want to have a chance of surviving the carnage and destroying the Alliance.

What is abandonware ?