I'm definitely happy to hear about the saves feature!
The details you've given regarding the monster sound absolutely amazing - I loved Alien Isolation, so the idea of the monster making use of the vents and other level features to hunt me down is very exciting for me. Out of interest, on my playthrough I heard noises from the monster whilst crawling through the tunnel, were these scripted or caused by the monster actively moving towards my location ahead of the next area?
Looking forward to the next update!