So, I played your hack and it was OK but fun, but... Spoiler Your spike sections reminds me of my ROM Hack (Troll Sonic 2) And also the rock-and-spring reminds me of my ROM Hack almostly... but you put it easier and fairer than what I did on my hack. Also, I enabled the Level Select and found out that Marble Zone is also playable too. But, it seems that your graphical redesign of Marble Zone is (probably?) on the works but very nice, too. And anyways, nice job on your hack!