Press space to shoot (or click the mouse (hold)). Dodge explosions and enemies. Collect coins to upgrade your player. The player follows the mouse pointer (mouse x). Boss spawns when the bar is at max. What's your best score.
Inspired by Warfame who made a shoot 'em up game (tutorial series). Finished for now. Sprites and music belong to their respective owners If you lose a heart in the beginning, restart the game.