a port of the classic Commodore 64 game

 The object of the game is to lift the Klystron Pod from
 the bottom of a cave and return it safely to space. The
 Pod is very heavy (compared to the ship) and this makes it
 tougher than it may seem.
 .
 You must be careful not to run out of fuel, crash into the
 cave walls, or let the enemy artillery outposts shoot you
 down.