Monsters! is a 2D action shooter inspired by the classic arcade game Robotron 2084.
Wielding “twin stick” controls, the player aims to defeat waves of enemy monsters bent on his destruction. The player must use caution, however, as every shot drains the player’s life/energy. The only way to stay alive is to continuously collect the hearts of the slain monsters. In addition, hearts of different colors provide a variety of “power-up” like abilities that the player can use to their advantage. The player uses two sets of controls, one to move, the other to fire. Each wave is a single screen populated with a number of enemy monsters of varying types. Coming into contact with an enemy or an enemy projectile will decrease the player’s life/energy. Defeating each level of monsters will allow the player to progress to a more difficult level. The game will progress infinitely as the player defeats each level.