Beastie Bay Gameplay is pretty straight forward and easy to learn for probably most players. Playing further in the game will unlock more features. After you complete an island you will unlock it’s ability to improve your game through various tourism options. These should be taking care of sooner rather than later so you can gain from the benefits.
It’s a good idea to keep getting new allies as you go along so you can keep up with the difficulty curve. Later in the game you will unlock the ability to purchase a scroll that will let you capture bosses so they can be used as allies. This should be purchased a s soon as possible to maximize the amount of bosses collected and so you don’t miss out on the good ones.
If your interested in related information that can help you out during gameplay check out the Beastie Bay Wiki.