A group of students in my software engineering class created a visually nice and playable whack-a-mole eye tracking game. It has a Mordor theme to it from Lord of the Rings. They even created their own calibration routine. It was created using the inexpensive eyetribe tracker, but it follows the mouse so as long as the eye tracker has mouse-following enabled, the game should work. It is written in Java and uses JavaFX.
Our NSF MRI RUI proposal, Acquisition of Eye Tracking Equipment to Support Research at UAA, has come to a close. Our final report will be available soon, but the funding has supported many of the publications and research outcomes reported on the site. The abstract is available at research.gov.