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I got it to work after marking the binary as executable.

Which was in terminal as:

chmod +x cs_demo.x86

The game works but I got simulator sickness almost immediately when I got off the floor and rotated my character. I shut it down to prevent me from getting any more sick. The Unity 3-D default display and rendering routines are really sluggish which is where the simulator sickness (motion sickness in games) occurs. From what I saw before I felt sick, looks intriguing.

We're sorry for the inconvenience of motion sickness, it is probably also due to "woobing camera" effect.

In the final game it will be possible disable this effect, however, we will take your feedback into account.

Thanks for the update, that could very well be what it is.