So far just the two seen in the preview images it looks like, the worm and the...cock-tail-scorpion? Yeah, that's what I'm calling it. Guess it's meant to look like a facehugger. Fortunately, there doesn't seem to be a fail-state; no health or anything like that to get in the way. So you can "safely" experiment with this version without fear of the level ending or having to start over, though there isn't much to see yet. Fingers crossed we see more in the near future.