I'm glad that you are gonna try to fix some of these flaws that are present in your mod, because they
are really annoying. I actually had the patience to play through the whole mod, and here are a few issues I had...
Emerald Coast and Windy Valley: These stages were alright, I thought. It shows that you actually tried doing something original instead of trying to make the real stages verbatim in an engine that is not fit for a game like Sonic Adventure.
Casinopolis: And here is where your mod starts to fall down. Trying to collect 250 rings to exit the level is tedious enough; trying to avoid enemies
while collecting 250 rings is just plain annoying. One hit from a crawla and you're better off restarting the level.
Ice Cap: I'm just simply gonna echo the one issue that plagues this level the most: Platforms that look like they should not crumble do crumble. In other words, there's certain crumbling platforms that look
exactly the same as platforms that don't crumble. Heck, crumbling platforms are simply everywhere in this mod... (also,
horrible music choice)
Twinkle Park: ...Which brings me up to Twinkle Park. This has pretty much all the same problems as Ice Cap, to a somewhat lesser degree. Have I even mentioned the enemy-kill sections yet? That's another issue I have with this mod; enemy-kill sections are also pretty much everywhere. It's annoying to be forced to stop somewhere and kill enemies just to progress.
Speed Highway:
I want to make a special note of this section. It looks like you should be able to jump from the box that I'm standing on up to the upper section (which contains a switch you need to press just to progress), but you can't. I actually had to cheat just to get past this section.
And then I found out (from reading D00D64's post) that you're actually supposed to
break the box (which doesn't even look breakable!), revealing a spring that takes you to the upper section here. Ugh. Again, I am glad that you are gonna fix this.
Other than that, this level was pretty meh. It has its issues.
Red Mountain: My main issue with this level was the pulley section with the flamethrower. If you're lucky enough, the flamethrower will turn off or you will be able to jump over the flames. If you're
not lucky, the flamethrower will simply ambush you and send you to your doom. Also, these pulleys look one-directional, but for some reason I was able to go
backwards on what was supposedly a one-directional pulley.
And the volcano section. It's too dark, and it contains
orange death water lava that you can't easily get out of as Sonic. Thankfully, there are no annoying crumbling platforms.
Sky Deck: Did somebody mention annoying crumbling platforms? Well, they make a huge return here, and honestly, I think this problem is actually
worse here than it was in Ice Cap. Simply because they are literally everywhere. They also make their presence known in the reverse-gravity sections that this level has, where crumbling platforms, that again, look
exactly the same as platforms that don't crumble, fall
up. Yes, certain platforms fall
up in this level.
Lost World and Final Egg: I grouped these two levels together for one reason: Both were lengthy button hunts that really weren't that difficult (to me, at least). That's pretty much it, except for Lost World, where there were some things I actually
liked. The section where the floor raises up toward the ceiling and you have to race to the other side quickly was kinda fun. And the scenery was actually really good in Lost World. Other than that, these stages aren't really that interesting. At least these final two stages had zero annoying crumbling platforms.
Actually, I should mention that most of the levels do have some a button hunt at some point. It got old. Quickly. Matter of fact, most of the levels played the same, with the same old enemy-kill sections and button hunts. No stage was relatively distinct from one another in terms of gameplay, with the notable exceptions of Sky Deck and its thousand crumbling platforms and Casinopolis and its annoying ring-gathering.
And that's really about it. This mod has so much promise, but it is seriously flawed as it is. Several other issues I had with this mod so far are already mentioned in D00D64's post. I haven't tried playing as any of the other characters yet.