Duuuude
I did NOT know this was from Doctor mario. Have you ever played brain age 2? It has a tetris-like game with pills that has this as it's theme song. Very cool, I like your choice of lead, it's very true to the original and it sort of pushes this feeling of subdued insanity.
The fade out isn't my favorite, but it works out well in this case. I guess the song was originally written to loop?
My favorite part was the dissonance of the organ at 0:41 and onward. 'tis a catchy tune, and done well.