Oinky Tonk vs Shark Boom
Oinky Tonk
Oinky Tonk is a casual game where you get to spin a wheel to decide whether you can attack another player, build your island, or plunder others' islands for money to fund the construction/decoration efforts for your island. There are, naturally, many islands that you will be able to progress to and eventually own.However, you can, in turn, be attacked (destroying some of the stuff you've built) and plundered (lose your cache of cash) as well so it would be wise to have shields on at all times. You can perform retaliatory attacks, thankfully, but this only works if your enemy doesn't have a shield on, obviously.
Generally, this game's gameplay is pretty similar to Pirate Kings and many other casual "Spin the Wheel"-type games, including its adorable graphics and fancy animation effects, and hence, Oinky Tonk would serve as a great alternative game to play.
Shark Boom
Shark Boom is more similar to Piggy Boom than Pirate Kings mainly because this game provides players with adorable 3D cartoon pets to collect. However, unlike Piggy Boom, these pets are mostly aesthetic in nature and won't be much help during a battle.That said, the gameplay in Shark Boom is pretty familiar especially if you've played Pirate Kings or Piggy Boom. Basically, what you'll need to do is to spin the wheel. The wheel will then decide whether you'll get to take an action, such as attacking other players' islands, or collect freebies like extra coins, spins and more. There are plenty of islands for you to build up in this game, and each of them have their own unique themes, ranging from the Ice Age to Jurassic World. The game also offers revenge attacks so make sure to have your base shielded up after an attack spree.
Shark Boom is definitely a great alternative game to play if you enjoy games like Pirate Kings, Piggy Boom or any other games like it.