Doesn't appear to have a config file and I've gone through the menu options 3-4 times and haven't found a way to invert the y axis on the mouse. You can invert the y axis on a game controller but who wants to play a game like this with a controller? I think I'm going to request a refund on Steam until they fix this. Bummer. Was really looking forward to this.

The "kexengine.cfg" config file can be found in: C:\Users\USERNAME\Saved Games\Nightdive Studios\Powerslave EX

Doesn't help with inverting mouselook.

Yeah, this is disappointing.
I can't play it without Y-axis inversion.

Almost every FPS offers this option, so it was amazing when I saw it was missing here.
I'm torn on whether to get a refund or wait for a patch.

I'm in the same boat here. Play my FPS games inverted mouse. How come this feature is missing from the game? I hope this is patched/fixed soon :(

This is Nighdive Studios. They will definitely patch it. Do not worry, just let them know.

Bummer, usually setting the y-speed to a negative value does the trick, here it disables the axis.

( Tried seta cl_msensitivityy -0.3 to no avail )

To anyone that doesn't already know: Nightdive has answered our prayers and patched it some weeks ago. And I've tested it and it works just fine. Thanks Nightdive!

Nightdive is one of the VERY FEW that has actually followed through and patched in a Y-axis inversion where there was none before. Most other games I've bought with this problem, the devs never did a damn thing about it. Kudos to Nightdive.