Descpription:
Fly a jetpacked-spaceman through continuously scrolling tunnels shooting
various spacecraft and wall-mounted cannons. The sections are marked
"A" to "Z" and there are end-of-level craft to destroy at E, J, O, T and Z.
The direction of scrolling changes after defeating each boss. Sections A
through E scroll right to left, F through J scroll top to bottom, etc.