Great hack overall! It stems up with a difficulty in the style of Kaizo Mario and then from the middle onwards is where it picks up. The only really minor issues come from sprite limitations (when the bubble pops and the goomba inside becomes invisible in the credits level).
The retry system is a cool addition, although I don't like how it doesn't display the death music once you choose to die rather than to retry. Then again, that's just a personal nitpick. And I'd keep it as a light kaizo hack mostly due to it not asking as much like in a hard kaizo hack in the first levels. Keep it up!
Visuals are really interesting, it's just enough so you feel something different and cool, but not at a point where it's too much are not SMW anymore.
Difficulty seems well balanced too, Kaizo Light seems to be it.
Recommended for people who look for a Kaizo hack.