I finished it just a few minutes ago.
Great game. It's the first SC game that I have played. I really enjoyed it.
So it is a short game. On normal difficulty the game challenge was just right for me. Each area is like a puzzle that you need to use against the enemies. The violence was very gratifying. 😀
I was in/out of the game a few times. No problems with save games etc. Mine was the the D2D version linked above.
The key to smooth gameplay seems to be v-sync off. Visually I could not tell the difference between medium and high detail. So I left it on medium for better framerate.
There seems to be an audio problem. Dialogue drops out, so I would recommend leaving subtitles on. IMO it is DX audio and Cider channels not quite adding up.
I'll try co-op and multiplayer and see if anyone else is playing.