First of all:
On IRC, FirePhoenix guaranteed me that I would not be disqualified if all I did to the ROM was saving a single level in Lunar Magic. I hope he's honorable enough to keep his promise, because that's all I've done to the ROM. (Thus, I haven't touched the overworld, other levels etc., so please move to Yoshi's Island 1 to play the level.)
Anyway, here's the IPS:
LINK
And, to reiterate: All I did to the ROM was loading it, editing level 105 and saving it.
If you have any questions about it, feel free to send me a PM or contact me on IRC.
(I guess my submission needs a name. I'll call it "Blocks of Chaos".)