Where the theme of Steins;Gate was time travel and the memoric self (in regards to what defines a person), Chaos;Head focuses more on the sight and sense of self from ego. Basically it features an unreliable narrator and as his grip on sanity is lost through the story, it gets harder and harder to tell what is reality and what is false/deceptive. It's really interesting, I think you'd like that stuff honestly. A lot of the stuff in Chaos;Head will feel like it barely resembles science, but the whole series is called "Science;Adventure", and almost all of the technology you see in Chaos;Head is actually patented IRL (in more infant stages, obviously).