Halo Zero is a great side-scrolling prequel to Halo: Combat Evolved, despite a slight control problem.
shooter, it expands Halo and takes it into the era that the Halo novels covered.
It has decent sound effects, using many of the sound effects of Halo: Combat Evolved. The soundtrack comes from Halo: Combat Evolved as well. The sprites used in the game are well made. And the game overall accurately portrays Halo as a side-scrolling shooter.
My only problem with this game really is the control system, it works well, but it sometimes sticks and dosen't work well sometimes.
Other than control problems, this is a good solid shooter.
8.6 out of 10, worth a download...