I haven't tested the game with XBox One controllers (I'm using wired 360 controllers), but did you try connecting the controller before launching the game? I haven't worked out all the bugs with connecting/disconnecting controllers during runtime yet, so maybe that was the issue? I'm glad you managed to make do with the current keyboard controls though!
Regarding the slidey handling, I originally did that to encourage the use of the grapple to take turns efficiently, but I may have overdone it a little bit. I'll play around and tweak the numbers. Also, I'm glad you liked the audio and visuals, that's always the part I struggle with most. Thanks for the feedback!