>>713647780
There's multiple beta branches, openbeta_win64 is the current base game beta (currently version 99r2b24) while ntt_development is the NTT version of that beta (version 100.030). They are both being developed alongside each other so I assume eventually they will both just become part of the game by default.

https://github.com/YAL-Game-Tools/bits-of-nuclear-throne/blob/main/Changelog.md