This game is big and complex, with 6 chapters (albeit some very short), real-time sequences, and a special helper robot.
But in all of its complicatedness, the game frequently falls short. Too many interacting states go unchecked. I couldn't progress past the challenge to the champion, and others have reported many other bugs (although several have played to completion).
You are the last human, a mouse-like man named Irvine. You have to help the cat-aliens (who have a system that reminds me of Star Trek), and prove yourself to them.