Love the presentation, from the physical Game Boy to the hand-written notes to the Misingno-style glitches. Only 90s kids will understand ;-)
It took me a while to get my head around the gameplay, but even when I did, it was a bit fiddly and repetitive. I was impressed by how much you packed in though. Sharper level design (i.e. two gates versus five in single level) might have helped the idea shine through.