Pirates Vs Undead

A long long time ago, pirates ruled the seas.  And they are always on the search for more treasures.  They will kill anyone or anything that stands on their way.  The pirate king John Roger saw a map that leads to a city of pure treasures.  When he got there, it was filled with undead.  He need to battle his way to the lost city of gold to claim it.   The game is played via mouse and the idea here is to defeat any undead that you see.  Don't let it pass your territory.  Summon some pirates to defend your territory.  Use some explosive barrel to immediately kill them.