Tip: Switch palace switches normally disappear if you replay the level. However, if you insert them as direct Map16 and use the hex-edit at $00EEB2 in the ROM map, you can replay the level without a problem.
This hack is not very good in general. The design is pretty flat and repetitive. It has various styles, mainly traditional and puzzle-ish design, but both aren't executed very well. It has some common flaws, like item babysitting, blind jumps and puzzles that aren't too easy to be broken. It needed some extra work overall.
Aesthetics kept vanilla. The author didn't even edit the original palettes, which is not bad though. Some blocks with different palettes looked weird though, like the "NO" blocks. It's not too awful from this point.
As only issue worth of mention, music breaks on accurate emulators.