YASH aka Yet Another SMW Hack is just generic, yet another SMW hack with nothing special about it.
-Wall-jumping and ground-pounding
-SMB2 health system
-175 A-coins and health upgrades to find
-First four worlds can be beaten in any order
-One optional world in which each level is unlocked by collecting A-coins
-7 Worlds, 32 Levels in total
-Each world has its own gimmick and set of sprites in them
Then you clearly haven't played that many snes games or dont know what you are talking about.
For example music is fucked up in many games, one clear example being earthworm jim. Also because said issue with music, its why many older hacks fails to work on real hardware and only works on zsnes. There are plenty of other reasons why not to use ZSNES.
Why can't I paly? it appears a message that says:
"This gamepak for use in your outdated msnes emulator.
use of this emulator may eesult in serious damage to your pc/phone/device.
Please refer to your instruction booklet for further information" and it does mothing when I pres any button.