Bullet hell is a genre built on an impossible-looking screen that turns out to have a path through it. Dense projectile patterns fired in mathematical arrangements create a puzzle that moves toward the player. The hitbox is tiny. The patterns are learnable. The skill is in recognizing patterns faster and moving with more precision each time you play.

Build the shmup you want by describing your enemy patterns, your ship weapon system, and your boss fight designs. Summer Engine builds the projectile spawner, the hitbox system, and the pattern sequencer. You focus on designing the moments of visual beauty and mechanical terror that make bullet hell unforgettable.

The best bullet hell games are works of authored craft. Every bullet in a boss pattern has a place. Every gap is designed to require exactly the right movement. When players survive a pattern they could not read last time, it is one of the most satisfying feelings in games. This is the game you are here to create.

• Solo devs who love the genre and want to create their own take on classic vertical or horizontal scrolling shmups.
• Designers with specific boss fight pattern ideas who need a working projectile system to test them in.
• Teams building a game for shmup fans who want something that rewards pattern mastery and repeated play.
• Anyone making a game where visual spectacle and precise movement combine into a singular experience.

• Boss Rush

  Build a game that is entirely boss fights. Each boss has distinct phases with escalating pattern complexity. No filler stages between memorable encounters.

• Vertical Scrolling Shmup

  Build a classic vertical scroller with stage enemies, mid-bosses, and a climactic final boss. Each stage introduces a new enemy type and pattern vocabulary.

• Roguelite Bullet Hell

  Layer random power-up selection between rooms on top of the core bullet hell gameplay. Each run creates a different weapon build that changes how players approach patterns.