Really nice visual upgrade from the original and it's neat that you can choose between different weapon loadouts at the start. The stages and bosses have more variety too but the difficulty is an absolute nightmare. Even with my baby strategy of abusing save-states, I had a hell of a time getting through a lot of parts that just felt plain unfair. I suppose it's to be expected from old arcade games trying to squeeze the quarters out of every kid but I was still baffled by what they expect from the player sometimes.