MUTE Button in the upper right corner.
For splitting creeps, put upgrade AOE towers at the end, that will kill them.
I fixed the major problem with tower placement and fixed several other bugs and did optimizations so the game is playable now.
Try maps with rivers if your up for a challenge.
Note on Rivers: You cannot build ninjas on rivers but pirates can go across them. They slow down signficantly, building towers along the riverbank and forcing pirates to go on rivers is a good idea.
If you don't like the rivers, play a non-river map.
Easy and medium are for getting used to the game. The real challenge is unlimited mode.
DO NOT TRY TO PUT NINJAS RIGHT ON TOP OF THE PIRATES, THAT DOES NOT WORK.
Note: Poison does extra damage to flying. To kill flying creep, put freeze/poison ninjas in their flying path.
Pirates enter at the pointer arrows and head toward the building/ship/structure. Stop them before they get there.
Some maps have two entry points, some only have one.