The Alpha 4 update adds in around 40 new types of aliens, alien plants, destructible environments and quite a bit more. There's now three variants for all the base alien types, so there's a lot of variety lurking around those corners.
It's a little older now, but this trailer gives you a reasonable idea of what it's like:
It's come along nicely since the initial release and it does seem to work really nicely on Linux. I am very impressed by the atmosphere in Xenomarine, it's not exactly scary, but it gives off a really good impression considering it's early in development. I shall be continuing to watch this with great interest.
Check those corners, watch out for acid blood and somebody wake up hicks!