The original Mario Bros. is honestly not very good. My main problem here is that the movement feels way too stiff and slippery at the same time. It's to the point that it's a struggle to get around the map and stun enemies to defeat them. (And those ice enemies can take advantage of your movement struggles to make platforms even harder to move on, which is real nice) The gameplay loop would be much more enjoyable if it wasn't so hard trying to maneuver yourself around. It also doesn't help that a much better version of this is included in all of the Super Mario Advance games as well as one of my favorite games of all time, Mario & Luigi: Superstar Saga. You're much better off playing that version on one of those games. (I couldn't imagine paying money for a sort of Virtual Console release of this when that version exists)