I tried it out for myself, and while the levels ape the genesis versions, they reconstructed parts of them to accomodate things the game lacks. You can't perform a jump kick, double jumping is extremely hard, so much so I thought it was omitted. In addition, you can no longer do a rainbow shuriken throw as the game is really stingy with shurikens. Wall jumping is also gone. Many enemies require more than one hit to die, some taking a ridiculous amount. Collision detection is spotty at times; sometimes you'll walk over a powerup and it won't register or you'll clearly hit an enemy but it won't count. Still, its playable if at times frustrating.
The horse ride on level 2 is missing the obstacles you jump over. This is because you're permanently crouched on the horse. Enemies only appear one at a time.
The second half of the level is missing the elevator ride towards the end. The boss doesn't warp the screen and reverse your controls like in the genesis version.
The level layout here is really changed, with most of the secrets completely gone. You also can't jump through ledges or platforms above you, which makes the level more straightforward. The second half of the level no longer has the boss in the background targeting you and taking potshots. This is because the boss is completely gone. It simply takes you to the next level.
This is as far as I've played. The surfboard stage is either gone or moved to another part of the game. Another thing, no continues. The game is a little generous with extra lives, but ionce they're gone thats it.
Good Lord...
