Ok, these are my thoughts:
This level pack is very different from other Sonic Adventure level packs/mods. Nothing in this level pack is a rip off of any SA level, they are unique for every single character, which is one hell of an acomplishment. Now to rate the levels:
Emerald Coast: Every problem that this level had has been fixed in the V2.
Windy Valley: Maybe it's just me, but Sonic is harder to control here. A wrong jump/thok and you die.
Casinopolis: I don't know why people say this is where it all falls down, it's a nice level, a different one. The other levels are platforming/get to the goal. It's preety cool the same system in SA could make it into your level pack.
IceCap: I like the design and almost everything of Ice Cap... except the Ice physics. Don't worry, it happens everytime in an ice level, but it can get annoying.
Speed Highway: Ok, the level was entertaining, but the idea of Speed Highway is SPEED, not button hunt. But since you edited it in V2, it's kinda better.
Sky Deck: this was HELL the first time, i lost like 7 lives in the level thanks to the gravity changing. But it's a preety nice challenge. Good work there.
Lost World: This is where your level pack starts to fall down. No problems until you reach the 3 locked doors. There are almost no checkpoints. At least put checkpoints after you unlock each door, because if you die, you have to start over the ENTIRE section.
Red Mountain: I loved the design, the flamethrowers can catch you off guard, but they are a good part of the level too. The rising lava inside the volcano? Didn't Expect that.*
Final Egg: Preety Good and Preety Challenging.
Hot Shelter: I have to say, playing as Amy takes a while to get used to. Specially because there are a lot of kill every enemy places.
This level pack is great. The only thing that frustrates me are the emblem locations. I could only find the Emblem in Emerald Coast, and I could only see the Emblem in Ice Cap. Also, nice stages for Big. I think it's better than the original Big levels. Good cameos for Big and Tikal too.
*Another thing that i WASN'T expecting was the voices within the levels. I first played Speed Highway zone (My favourite SA stage) and when i got to the long jump, I jumped out of my chair when i heard Sonic's "WOAH!". That was a funny yet hilarious addition.
9/10 - Awesome job, STHE1230.