I'm replaying some GB games for ranking, and this game isn't great. The physics and momentum feel off, and the platforming is some of the most stress enducing i've experienced. It doesnt have a good flow, as there are times where I had to play without run button held so i don't fall off. due to strange acceleration. Unlike Super Mario Bros. games on NES, where you can hold run and, well, run though the levels without any issues as they have great flow and the levels are mindful of the player's capabilities. For this game however, you're likely to die in a pit trying to land on a moving platform with stiff midair controls. Even the first Super Mario Bros. game has better physics. Sure, that one also has stiff controls, but at least the momentum and gravity are predictable, while in this game, you gain high speed the instant you hold a direction with run button held. I managed to accidentally fall into a pit a few times due to this. This game isn't bad, it's actually pretty short and has decent music, but I'd rather play any other Mario game over this.