Super Boy is actually so impossibly amazing that most people see it in the form of a mediocre rip-off of Super Mario Brothers.  Through intense training, I have found it in it's true form; a game where you ride a robotic unicorn covered in machine guns and bazookas around the flaming desert trying to gun down as many demonic Superman clones as you can before they get you.  The reason for the double jump is because when you kick an enemy to death, you can steal it's soul through your foot and double jump.  The reason for Pink Mario  is the flames everywhere, just barely showing on the character.  The reason the enemies descend through the floor is that they descend from a flaming rainbow bridge that has been captured (you can reclaim it for bonus points) and used to get to lower areas by enemies.  And the reason for there being only four worlds is that the other four were so awesome, they were banned from the universe.
I just blew your mind, didn't I? 

This game is awesome for all of the WRONG reasons.  First of all, Mario becomes PINK JAMMIES MARIO!  Pink Jammies Mario has the power of what I call the "Floaty Jump", which means he goes up, then floats up a little more after stopping.  He can also do a faux  "Double Jump": after jumping on an enemy, jump again to go even more ridiculously high.  For these reasons, I declare the game "So Bad It's Good", and a treat for just a little while.  Mario controls about as well as a really mad horse on ice skates in an oil slick and covered in grease and laminated, which makes this game FAR more challenging than the original Super Mario Bros.  I personally think it's a horribly done port: the first levels are identical to the original, except for, I believe, the first castle.  Enemies look basically the same, but when walking off a ledge, they go down diagonally THROUGH THE EDGE OF THE LEDGE and continue in that straight line.  After hitting another wall, they reverse trajectory, making for a... memorable scene in 1-2.  Mushrooms also do this, and, on the subject of power-ups, instead of having them appear in fixed places, there's a random(and low) chance that a mushroom or fire flower will pop out instead of you getting extra points.  There's no extra lives in this game THAT I KNOW OF, which adds to the "challenge".
In short, this game is amazingly bad.

I found this game to be VERY entertaining.  For all the wrong reasons, as with these games so often.  For example, after Mario *AHEM* I mean Super Boy jumps, he stops for a split second, and floats up a little more.  Also, when correctly done, you can do a sort of double jump.  After the initial bounce given by jumping on an enemy's head, you can jump again.  Just entertaining for the way it looks.
Also, for some inexplicable reason, they made Mario Pink.
PINK MARIO!

He handles just as well as ice skates that have been greased up and are on the worlds slipperiest ice while also navigating an oil spill.  BUT WORSE.
They remove the power ups, and the one-ups as well, making this game a good challenge!
In 2 words:
Hilariously Awful.
Super Boy, GO!  JOIN THE RANKS OF BIG RIGS AND THE TOWN WITH NO NAME, AND CLAIM ETERNAL FAME/OBSCURITY AT THE SAME TIME!
I give this game 10/10
Graphics 2/10 (an extra point given for PINK MARIO ) 
Control -9000/10
Story 9/10 (Pink Mario has to go right and slide down all the flagpoles LIKE A BOSS, the end.  Wow.)
Fun Factor 10000/10 (Bonus points for the floaty jump, the double jump, and PINK MARIO )
Fun/Awful Fact: Click on MSX, and this game appears on THE FIRST PAGE.  Also, this game was apparently so incredibly popular that they made not one, but TWO sequels:  At the time of writing, Super Boy 3 shares the main page with the legendary original.
Good night, and
PINK MARIO!