The specific build Regressor -v0.4- is often referred to by testers as the "Memory Leak" update—not for technical issues, but for a specific gameplay mechanic.
The titular feature of this version is the Regression System. In standard Piggy, dying simply respawns you at the start of the round. In Regressor -v0.4-, death has consequences. Regressor -v0.4- -Piggy games-
If you boot up this game blind, you will lose. Here is the optimized meta for the current patch (v0.4): The specific build Regressor -v0