The repack unlocks all tier 4 creatures from the start (a bug, but a useful one). Normally, you start with "Bovine Beta." In the repack, you can immediately attempt "Xenomorph Queen" extractions. Your starter syringe will break. Instead, follow this correct progression:
A comprehensive repack typically includes several key resources: inseminator game guide repack
The Repack allows you to skip certain languages. To save space: The repack unlocks all tier 4 creatures from