Nice map, BUUT of course, there are a few problems:
a) It's too easy to monitorhop into the deathpit.
c) At one point, there's an arrow I ALWAYS mistake for a platform, which I end up barely managing to jump on top of, then seeing the other side of the track. Grrrr...
d) One platform is too thin for a checkpoint. Every time I respawn on it, I fall if I don't go forward as I respawn. Otherwise it's waaaah-KERSPLAT. Put the check a little further, or make the FOF wider. PLEASE. It's anoyying. EDIT: It's useless, too. I mean, there's another checkpoint nearby too, so why bother?
e) Like Angelus said, it's like DGZ in terms of difficulty. It's fun when you get practice, but some people hate platforming in SRB2. Like me. DGZ wasn't all platforming, but there's a bit where you have to platform up through a room, avoiding the death gates. Here, not only does it have the anti-shortcut death-walls, but I mean, this is constant platforming, except for the so-called "pit stop".
f) I had to freaking use startlives, like in DGZ.
g) Most barriers are absolutely useless, considering there's nothing whatsoever to hurt you. The only one useful is the Whirlwind barrier.
h) WHY MUST THE METEOR SHORTCUT HAVE AN ICE EFFECT!? It's anoyying, and unrealistic. It's rock, duh. If it's supposed to have a layer of ice, you COULD add a thin-ish layer of an extra wall with the glass texture, at least.
Okay, I've been doing runs for all characters this time:
Sonic:
1st run: Hard as heck. It's a constant platformer.
2nd run: A little better, but I had to restart because I KEPT FALLING AT THAT CHECKPOINT! Also, I noticed your alternate route through the big meteor. Nice, but WHY does it have to have the Ice effect? It's ROCK, for heck's sake! Although the Zoomtube to avoid bad drops is a good idea, but make it go a bit faster, a'ight? I didn't restock this time, I think.
Tails:
1st run: Not too hard, but I still had to restock. Too easy to spinfly, making players get an advantage over others.
2nd run: Better, this time with the shortcut. But the Ice effect on the shortcut anoyys me to heck and back.
KTE:
1st run: F YEAH!! The trick is when to stop gliding and land. I didn't fall even once!
2nd run: Speedrun. That's what it was. A speedrun.
Good things about the design:
1) Non-thokfest, yay.
2) Whirlwind shields are useful here.
3) Prevents too many people from using Tails always, because one wrong landing and they drop, usually. I saved myself from falling once in ball form because I could fly, but it sure delayed me.
4) Good decors, at least.