Bullet Heaven

Bullet Heaven inverts the older bullet-hell shooter: the player's own weapons fire automatically and untargeted, instead of a small hitbox threading a screen the enemy fills with projectiles, and the entire skill of the genre collapses into movement — where to stand, and when to leave. Vampire Survivors (2022, poncle) popularised the template rather than inventing it: its designer has credited the mobile game Magic Survival (2019) as the direct model, with Crimsonland (2003) further back. The name is still unsettled — survivors-like, auto-shooter, horde survivor and bullet heaven all circulate, the last winning a developer poll only in 2025. The template is a single character on an open field, hordes spawning in increasing density, and a small arsenal that levels up and, at set combinations, evolves: the upgraded weapon replaces the base one, while the passive item that unlocked it stays in the build.

The challenge curve runs on minute-scale power curves rather than encounter-scale ones. A run is 15, 20 or 30 minutes depending on the stage, a visible countdown that functions as Time as Resource in its purest form: the clock is the real opponent, escalating spawn density on a schedule the player cannot slow, only outrun by getting strong first. Upgrades arrive fast enough that build decisions come every few seconds, earning comparison to a Roguelike Deckbuilder — a small offered set, drafted repeatedly, with combination discovery as the content and reward randomness serving the same Variable-Ratio Reinforcement function. Runs still end in Permadeath, but the loss carries little of a roguelike's weight once Meta-Progression currencies persist past it.

That the genre keeps real build expression despite near-zero input complexity — no aiming, minimal reaction skill, movement as the only verb — is its most-argued design claim, and it sits close enough to an Idle Game that the boundary is genuinely contested: both automate moment-to-moment action and ask the player to optimise a system rather than execute inputs. What separates them for most players is that positioning stays live and lethal throughout, where an idle game eventually removes the player's presence altogether — helped by a Game Feel dense enough with automatic kills that it has to work to stay legible, closing a short, replayable Compulsion Loop.