Ok, I just played it, and here's my review, and how constructive critisism should be done.
Hotsprings Village act 1: 1/10. Too short to be a single player stage. Too many rings at the start, and finding the spring in the water was annoying until I suddenly plunged out of the water, and it's also too bland, and lacks in scenery. You need to start this stage again.
Hotsprings Village act 2: 2/10: a small improvemnt, but again, way too short, and also has way too much rings at the start. It is too bland again, and lacks in scenery, The chaos emerald is too easy to get, and the deathpit under the platform doesn't work. Also why have you put the water effect to damagae players while the other stage didn't have that? it just doesn't work well. This needs revamping, or serious edits.
Hotsprings Village act 3: 3/10, just a normal boss map. It's ok. but it's too bland, and too many rings in one place. Spread them out a bit, also if you took a bit more time making this stage, it'd be better. Remove the armageddon box too, as it's a cheap way of beating the boss.
Ok, moving onto Volcanic Valley.
Volcanic Valley act 1: 3/10 it's slowly getting there, but again, alot of flaws in this stage. The stage is way too large, and there is hardley anything in it. The item & enemy placement was horrible, and the hazards were plain annoying too. Again, needs big edits.
Volcanic Valley act 2: 2/10: it's gone back to just like the 1st zone. Again, the enemy placement was worse than the 1st act, and it's too short. The only thing I did like in this stage was the texture usage in some parts. But this needs a revamp I'm afraid in my opinion.
Volcanic Valley act 3: 3/10 okish, but you shouldn't have monitors in there as it makes it too easy. Also, take a bit more time on this stage, and it would of looked a small bit promising.
Now onto the multiplaer levels.
Match stages:
Greenflower match: 1/10 too many rings in 1 place, and is way too small to play match in. You need to start this one again.
Twin Hills: 2/10 it's just 2 large sectors with water in the middle of it. You need to take time when you are making a stage. Also spread the rings out a bit.
SA2 City: 3/10 It's getting there, but not that far yet. It's a small version of starlit warehouse, but you need to work on it a bit more. My biggest problem with the stage is it could end up as a RP/Hangout level if you are not careful as most town/city stages are big targets for those.
Frozen Hillside: 0/10, unplayable in terms of playing the stage especailly as characters with no flight abilities, and way too small. Enough said.
Now onto the CTF stages.
Blizzard Hills: 2/10, too easy, and too many bomb ring placements in such a small stage, although I do kind of like the idea of those tree things. Make the stage bigger.
Greenflower CTF: 4/10, this one wasn't too bad in terms of design, although you could of spent a bit more time fixing some bits up especailly the rings, scenery etc. If you did, then this would of turned out good.
Midnight war: 3/10 it's slowly getting there, but again. you rbiggest problem is having the rings too close, plus it's too easy, and lacks in challene. Put some different gimmicks in or something. Look in the offical maps to get some ideas.
Final rating: 2 - 3/10. You need to really concentrate on 1 map at a time, and also some need revamping and major edits. Don't rush your maps, as rushing it tends to give you not the best of quality of the stages itself. Personally, I don't think you are ready to take on a large scale mod on yet. Make a few levels (and take your time on them) read a few tutorials, and submit them here. Then if you are ready, and feel confident in making a mod, then you can take that next step up.
I think as time comes on, I reckon you would be a good level designer, everyone starts new. I hope this feedback helps you in the future.