I actually had a pretty hard time with this one. Your Mario muscle memory built up over a lifetime really works against you here, and you'll find yourself overcorrecting your stops and sliding off platforms backwards, landing right next to enemies instead of on their heads (sprites are WAY bigger than the actual hitboxes), and generally trying to play this faster than it's really built for.

But I dunno, it's still a good time and an incredibly fleshed out experience for a Game Boy launch title.