Antibirth introduces new unique level seeds that add various effects on the game:
|Heavily distorts the screen and audio similar to the one caused by frequent usage of the Black Mushroom.|
|Replaces walls with a background that cycles between various neon-colors and flashes whenever an enemy is killed.|
|Desaturates all colors except red, slightly distorts the screen, adds a darkness overlay and a grainy filter.|
|Reskins Jacob & Esau into Green Pepper and Baggy Cap, two of _Kilburn's original characters.|
- The names and effects of GETA GRIP and TH1K SK1N are references to the game Hotline Miami.