Hey Chili41,
The game should be both x86 and 64 bit. I originally uploaded the build without using itch's command line tool. The problem may be that you have the launch version of the game which has since been updated. Quickly Re-installing should fix your problem and give you the patchable version of the game that will continue to get updates. Let me know if this did not solve your problem ill look right into it.
Thanks,
Rafi