Level resets if you exit a door?
Not sure if this is a bug or intentional, but if you enter a door after finding the key, then exit again... you have to restart the previous stage / location with all enemies/items up. Noticed that after getting through the alleyway with the dogs and going into the room with the chainsaw guys with heat armor.
Also would have been nice to see the strength (speed) of weapons compared to what you were about to exchange it with. Shotgun seemed nearly worthless in this game compared to other weapons. Flamethrower appeared to be one of the better ones imo.