My Mermaid Boyfriend is a free casual game. Players can explore underwater worlds, interact with sea creatures and make friends with them. They can even design and build their own sea-based city. However, in order to survive and thrive, they must fight against other sea creatures.

The gameplay is based on simulating a mermaid dress party. Players can design their own costumes and choose their favorite sea creatures to dress up with. They can also pick their favorite tunes and even make their own music.

The game includes many items and sea creatures, and players can collect them all to build their own sea-based city.