Sonic Quest ... I had seen one somewhere. I think there was "Jade Coast Zone" with Palmtree Panic music.
The music of Sonic Megadrive. So ... I think you must have a large library of mp3 old video games. You must begin by using the best music you have, because in the life, we can't make a level with all music that you have if you have more of 800-1000 music !
So ... First, I noticed that the music Ice Cap had a little problem when the music was over. It's not pretty. Or you can cut the end of music with software like Audacity, where the volume starts to drop, or you can look on Youtube the Ice Cap music in version 10 minutes, and download the video in mp3 ! Websites like FLV2MP3 or Video2mp3 are very useful for downloading videos from Youtube and keeping only the music of the video ! If I tell you this, it's because generally, the video game music are very very good quality on Youtube. Look for yourself !
(Here is the music of act 2. I think she would better.)
http://www.youtube.com/watch?gl=GB&annotation_id=annotation_37811&feature=iv&hl=en-GB&v=X6eq03LnQ_A
Now the wad in general.
There is something in you that I appreciate very much, it's a simple style but effective. The levels of CTF and Match are not necessarily very hard to build, but I like them very much. I prefer this style levels as levels who have too much detail (style Egg Rock, where sectors are very very very small ...)
However, I think the sprites boxes ... are a bit small. I do not think you should touch the boxes sprites.
Before-all, know that you'd better put Items correctly. There's too much ...
I have a feeling that you like the springs. Try to put something else from time to time! Stairs, platforms where you have to jump, etc.
I noticed in the snowy level something quickly. It resembles a style of a standard SRB2 level... Yes, I mean Icycle Falls! There is a part with some floating ice, and a second part with a main road constructed in the same way ... It might be slightly modified.
The road in right straight linking the two bases is too short. You should complicate it. (huh...with stairs...I don't know...)
Combat Coast is fairly positive. I like it, except perhaps a little too much decoration (it blurs the vision), and even blue springs somewhere near the base ...
Emerald Valley ... you say you think it looks like Sapphire Falls? Personally, I see a mixture of 1 Meadow Match in the air and 1 Meadow Match on the ground.
Hmm ... there is not enough variation between the top and bottom. The Items are bad.
Green Canyon is my favorite. I saw Jade Coast + Meadow Match. But he remains well. This is a level that I rather liked because the items are a little better placed and because he is simple. However, it is a little hard to get out of the big pond underwater.
Exceptionally, I think you should put a little more spring here for the player can emerge more easily!