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I know the folks behind this game are working on an update, but here's a reasonably quick fix while everyone waits...

First, go and download RawAccel here- https://github.com/a1xd/rawaccel/releases/download/v1.4.4/RawAccel_v1.4.4.zip

Next, install that and restart your PC (it's required for the program to work).

After that, grab InvertMouse here- https://github.com/oleg-st/InvertMouse/releases/download/1.0.1/InvertMouse.zip

Run the InvertMouse executable and make sure that the checkboxes for "When cursor is hidden" and "Y Axis" are checked, and that "RawAccel" is in the "Driver" window. After that, start the game and it should kick in after a second once the game's started.

I've tested this on this game and it works fine :)