Unfortunately Microsoft confusingly names things here win32 is the platform not the processor architecture, and it supports 64-bit these days.
64-bit Windows has the Win32 API at its core, with pointer sizes (and pointer sized things) increased to 64-bits, but otherwise the API is intact. There is no Win64 API. It is an unfortunate artifact of naming that the Win32 API is at the heart of writing 64-bit unmanaged code, but that is history for you.
But fortunately for you I do have a Windows 32- bit build, I'd just not uploaded it to Itch.io yet. I was waiting for the next release, but since you asked I've uploaded it :-)