For this playthrough, I played it with the widescreen patch. Since more enemies and obstacles were on the screen at once, it made some of the timing different. Some levels it made trivially easy, a few became brutally difficult, and most were just about the same. All and all I kinda just consider playing with this patch a pretty freakin' neat alternative take rather than a new definitive way to play SMW from this point forward.
Other than that what do you want me to say? It's the hood classic, Super Mario World.