On the one hand, not being anything near a decent firearm handler myself, 'why was he holding the gun like that the whole time' (unless he didn't know how he was supposed to hold it himself or there was a particular reason why) although on that note, he was almost constantly moving fast enough that it didn't matter as far as what we could see.
On the other hand, as opposed to him exploring, I got a vibe more akin to a character that's lived there a good portion of recent life and that he runs for a reason (something more akin to a survivor of something like what happened in 'I Am Legend', but with encounter suits); also that whatever it was that was watching him is a product of his imagination, which is why he finally got the feeling that someone was there. Nice animation quality, reminded me of Team Fortress 2 for a bit, and I noticed that at the computer station, although every other movement he made had sound, whatever he was doing with his hands was hidden; that is to say, clever on the point where precise animation was not made necessary, and easier.
Wonder what he'll go through next?