Co-Op: The Unexpected Coolness

Co-op was unexpectedly really cool to me about co-op but it definitely messes with what's difficult on what's not. The most obvious one is you can die at a level and then be brought back the next level if the person survives and finds the coffin. If i'm carrying you and you have the shotgun you no longer get knock back if you use plasma cannon which is wild. There are some other classic weird things you can do in co-op.