In this paper we compare eye tracking input (ETI) to traditional input (TI), and evaluate what effect it has on player immersion, engagement, and performance. There is little research done in this field, and to our knowledge, engagement has not been measured with eye tracking before. Based on our research, we developed a custom game with ETI in mind that has an emergent narrative and focuses on exploration and visual searching. We examine how ETI affects our dependent variables. Due to complications involving limited test equipment, we were unable to reach valid results in our testing. Even so, initial results seem promising and encourage further testing.