-Rapidly switching the weapons causes a choppy effect on the arms/guns. Not sure how much you can do to mitigate that though, or if it would make it feel less responsive.
-I was discovered when sneaking in the supermarket, I was surprised when one of the enemies was walking over top the shelving units. Not sure if intended or not. The other guy I rounded on was running in place into a shelf.
-Running into the potted cactus doesn't hurt me. I'm both relieved and a little disappointed.
-Swimming seems alright. When more visuals are applied to the underwater effect, it will feel more convincing.
-An enemy walked into the water, I heard shooting but I'm not sure if he was missing or if he couldn't shoot out of the river. When I jumped in to knife him, he seemed to be floating and moving slowly, so that seems about right.
-I was shooting at 2 melee guys running at me. I decided to hold down shoot since they were in a line, but the first one's death animation was soaking most of my bullets meant for the one behind. I guess that's fine, though I would rather not have it effect bullets.
Finished the demo, had a good time. I especially like the theme of level 2, as a Venice esque location. Though, I couldn't see any secondary paths by going into the water, which seems apt for such a map. Keep up the good work.