Erebus

The planet Erebus has been developed by Earth into a giant refinery to turn
it’s waste into useful gases and chemicals and is fully automated with rare
interaction from humans. It has been noticed in recent times that the nearby
planet Hadebus, sworn enemy of Earth, has been sending space crafts to
Erebus. Further investigations has found out that the Hadeans are using the
refinery to produce a toxic nerve gas that can wipe out the human race. You
have been chosen to fly through various levels of the refinery and destroy the
alien crafts to save mankind.

The game is a horizontal shooter viewed from above with the screen scrolling
to the left or the right when you move. You must blast any alien craft you
encounter while avoiding them or their weapons and if you are hit then you
lose one of three lives. Touching any of the scenery or buildings also loses a
life. Each level is made up of sections surrounding a dimension duct and you
must fly over every section to open up the duct. A small map of the sections
is shown on the bottom right and when every section is green then the duct
will open. You then play a bonus game where you on on the left of the screen
and alien crafts fly from the right. You can only move up or down to avoid or
shoot the craft and the aim is to last 30 seconds before moving to the next
level.