A universe of small islands inhabited by cube-shaped bird creatures called Kubebirds — social, peaceful, and completely unprepared for the wicked insects that invade their home. In response, Kubebirds evolve special combat skills. The player controls a Kubebird through waves of attacking insects, using specialized ammunition while keeping each Kubebird's unique abilities in mind. Breeding expands the collection. Three Kubebirds are required to enter combat, and tokens earned through fighting can be spent on making them sturdier and more powerful. The in-game Marketplace allows Kubebirds to be bought and sold between players. The game combines the shoot-'em-up format with a blockchain-based play-to-earn structure accessible from any device with a stable connection.