Fun game. I loved the way when you shot, the casings bounced around on the ground and made noise. Really great detail.
I agree with the other comments that the wall slide was rough to use, because you had to swing your mouse up to use it after having it down to propel yourself into the wall. The gunshots were too loud and for half the game I didn't even realize the music, because I'd turned the sound down due to the gunshots being so loud. People said there were level shortcuts, but I just ended up at the tavern every time.