This would honestly be my dream hack, if it weren't for some glarinf issues in the gameplay.
As Thrognar said, the logs are far too fast. I, however, don't have so much issues with Phanto. I will say in some places, corridors are far too narrow, with World 1-3 being an example. Also the fact you cannot destroy the volcano plant things is another issue, which leads to many unnecessary lives being lost. Also, for the 3rd boss, the General Shyguy, the amount of times you must jump on him is ridiculous for how Mario can only have 3 HP max if he has an item in reserve. Also, you get no warning, and no reaction time for when the Shyguy boss goes waddling about, making unnecessary hits happen.
Balance the difficulty, and you will probably have what in my opinion would be one of the greatest SMW hacks ever made.
This is brilliant. But, the falling logs are way too fast, as are Phantos, and Mouser is the most annoying thing in the history of the galaxy in this game. Also, save points would be nice. So ... minor tweaks needed but overall fantastic.