So... While being on an oxygen crystal collecting expedition your co-pilot is taken hostage, thrown into the local (alien) jail and it's up to you to rescue him.
You do this by destroying alien eggs, collecting blue mushrooms (the aliens source of power.. yes, really) and dispatching with the various baddies roaming the landscape.
Technically this is a nice game, it's got good music, decent enough (if somewhat black) graphics and isn't a straight FPS affair. But it does somewhat lack in the gameplay department.
We were unable to clear even one sector despite numerous tries and found ourselves struggling to navigate the landscape which all looks identical. If you've got time to invest, it's worth checking out however.