Hi, Asin. After a bit of research, unfortunately I don't want to claim support for Windows Vista as the last .NET version on Vista was 4.6. One of the libraries I use, SadConsole, requires 4.6.1! Here's the official MS .NET requirements matrix: https://docs.microsoft.com/en-us/dotnet/framework/get-started/system-requirement...
Having said that, .NET 4.7.1 (the version the game currently targets) may work on Vista anyway. I don't have anyway of confirming this, though.
As for 32 vs 64 bit, the game should run on either. Sorry for the bad news, but thank you for checking out the game anyway!