From now the game is playable as 64bit by default (v.1.2.0:30), but it's possible to play an Alternative 32-bit version(v.1.2.0:19) that uses a bit less memory in sacrifice to be more compatible with old computers. It also loses compatibility with new devices.
Playing 32bit is only recommended if you have any issues with the 64bit version.
NOTES:
- Features and progress are shared between versions. You don't have to start again.
- In order to play his version, you need to upgrade the game through Steam to version 1.2.0