This hack surely has wonderful graphics, and the effort you put into changing sprites for every single level is colossal !
However, besides these graphical changes, the levels are very repetitive, with the same pattern and enemy used type in each one, with however some nice adds such as bloopers.
The overworld is also very simple. Finally, there is no boss fight, even in the last level.
I found 31 exits instead of 32 listed here. When I count all levels on the overworld, I actually find 32, so I suppose that the last level doesn't count as an exit, acting much like Bowser's castle ? If it's the case, it would be nice to update the actual number of countable exits to 31 =]
I'll give you 6/10 (3 stars), I think if you bring much creativity in your levels, this would bring a wonderful hack, because the palettes and level-specific enemies are truly great =]