Survivors-like & Bullet Heaven Framework
Faven Games
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The systems layer of a survivors-like / bullet-heaven game: spawning, auto-firing weapons, a level-up draft, weapon evolutions, scaling hordes, bosses and meta progression. Render-agnostic, no art.The systems behind survivors-like / bullet-heaven games (Vampire Survivors, Brotato, Halls of Torment) as a drop-in framework. You bring the art; it runs the run.What it does:-Auto-firing weapons with seven behaviours: projectile, spread, area, aura, orbit, melee, chain-Level-up draft with rarities, reroll, banish and skip-Weapon evolutions: a max-level weapon plus a passive becomes a stronger weapon-Spawn director with budget pacing, time scaling and scheduled elite and boss waves-One stat system shared by characters, passives and permanent meta upgrades-XP gems, magnet pickup, gold, health, revivals, run timer and win or lose-Deterministic engine: same seed and input give the same runRequirements:-Unity 2021.3+. No third-party packages. The demos use Unity's classic Input.Support:-info@favengames.comDocumentation is included in the package (README + Documentation).Render-agnostic systems framework: the engine simulates the run and raises events, so it works in Built-in, URP and HDRP and in 2D or 3D with your own art and camera. Deterministic fixed-step engine with seeded RNG, spatial-grid enemy queries and pooled entities. Split into Runtime, UI, Editor and Demo assembly definitions under the FavenGames.Survivors namespace, single root folder, full C# source. No SDKs are bundled or required and it compiles clean on a fresh project. Meta progression saves through a swappable store (PlayerPrefs and file included). Designer tools: a setup window, a content validator and an engine-exact Run Balance Simulator.No generative AI art, audio, or 3D models are included in this package. All marketing images are rendered programmatically with Python (Pillow), not an AI image generator. The store description is written in plain language and reviewed by the developer.





