This is likely a nod that the pentagon shape is the only shape that is not a boss character and by extension, the only shape that is not represented as a character in Story Mode. One of the loading tips mentioned that while 'all shapes are equal', the game 'personally like the pentagon more'.There were two other shapes that are unused in the game, being the star and the positive symbol (or also known as the cross).However, that was changed into the triangle in later stages of the game's development.

In the very first teaser of the game, the second player appeared to be a yellow version of the square.

The player characters have different colors in teasers, screenshots and trailers before the final game, due to exporting issues of the game's engine.

It may be irritable, as seen when the player moves to a space that the character cannot actually move, or if the player frequently takes damage when controlling the Helicopter. The character is close and helpful, notably when the Big Square is with them. The character seems to be determined in finishing a level in the game, and impressive tenacity is shown in the Game Over screen, but the character seems to show signs of fear such as being chased around during some of the story sequences. Much of the player character's personality is left up to interpretation by the player. It’s a new spin on SHMUPs, adding a layer of coop that’s at the core of the game: 'cause everything is better with friends. Just Shapes & Beats' is a chaotic co-op musical bullet-hell based on three simple things: avoid Shapes, move to the rad Beats, and die, repeatedly. Player 1 will control the Blue Square during story sequences as no other players are featured during those sequences. Description A game about shapes, and about beats. The Blue Square (also known as the Blue Cube or Hero as an internal reference) is the main protagonist of Just Shapes & Beats's storyline. In Story Mode, the player controls the Blue Square.

Just beats and shapes