Blast ships.  Grab any surviving bits from their wreckage.  Bolt the salvaged goods onto your ship to make yourself stronger (and repair any damage).  Goto 10. While flying about, you may spot a ship with a powerful laser cannon that you want.  If it’s a peaceful ship, you need to decide whether it’s worth attracting…

Derek Yu’s Spelunky is a fantastic free game for Windows.  it’s a blend between platformer and NetHack;  platforming mechanics in a randomly generated world, with dozens of different objects and monsters, and all sorts of secrets and fun little game mechanics to discover.  It’s also one of the few games which has me regularly rebooting into Windows…