I have an issue with humans being able to shoot through walls. Like, wth? That's kind of unfair. :(
Also, the complaints people are having with controls does NOT stem directly from the controls themselves. Your very first tutorial sentence is misleading. They don't need to wall slide out of the first pit, they need to hold "x" to grab a ledge. After I realized that, I quickly figured out what else "x" could do and had no problems.
HOWEVER...the game's attack response times are bad. Instead of jumping out of a tree and swooping down on my enemies, I sit there and get shot in the face despite hitting "z" as fast as I can and waiting for JUST the right moment.
Finally, I fell through the floor and didn't get auto-killed despite your update. Not that it was a problem, I just refreshed the page.