Okay, that's odd. I've tested with 360 controller on Windows 10. Is it wired or wireless? I'll look into it, see if there is a known issue.
Viewing post in Development build 1.0.1d1 has been released!
This *should* be fixed in the latest build: https://8bitape.itch.io/swords...
Essentially it only listens to input from one connected device. Would massively appreciate it if you were able to give it a spin and let me know how you get on!