Okay, I just played the beta, and I'm going to give my review on the MOD's status. First off, let me state that I never even played this MOD or the original game before beta testing this. Therefore, even though I heard stuff about this, I had little idea what to expect. So, I've gone through the levels pretty thoroughly, and this is what I can sum up.
First and foremost, the basics: The gameplay is entirely in SA mode, but oftentimes the game seems to switch in and out of analog... considering I'm playing the private beta wad, I'm not sure if this is in the public version, but if it is, then I advise you to choose Coop instead of Single Player, if you choose to play this MOD. There's a couple hubworlds as well as levels where you must reach the goal in pretty much a style of "Point A -> Point B". The bosses, besides having analog and SA mode enabled, aren't that much different than any other stage.
Starting out a single player game starts you off in Soleana City, one of the two existing hubworlds in this MOD. Now, I don't have a lightning fast computer, so this may not apply to everybody, but the first thing I notice is an instant drop in framerate. For the most part, the level looks pretty nice. But clearly, its number of sectors is what is slow my game down, and I can guess that this is largely because of the "fake slopes" in the map, such as the bridges. It's difficult to know where you're supposed to go, but you generally end up in a level warp pretty quickly. Unfortunately, the levels themselves are basically a collection of multiple gameplay flaws as well as the aforementioned framerate lag.
Almost each level geographically seems to be dominated by bottomless pits, which very easily lead to cheap deaths. However, the deaths are often repayable because of the simply silly placement of 1 ups throughout the levels. Generally there will only be one or two paths to go through, and in a majority of the levels, zoom tubes are dominant. Much of your time in the levels will be sent sitting back while a zoom tube does its thing. There are many custom camera angles that, while I guess trying to be cinematic, only disorient the player and falter gameplay.
Gimmicks can sometimes be found in the level, such as waterslides, lava, and quicksand. These don't enhance the gameplay. The waterslide, while interesting at first, is not used in a way that would make the level stand out and... well, fun, and simply exists to exist. The lava and quicksand are only a few fracunits above a bottomless pit, so they aren't really any more minor a hazard than a death pit itself, even in one of the boss arenas. There's a button-hunting section in one of the levels I played, but unfortunately, this isn't executed in any interesting fashion and was simply another chore.
The lack of consistency in some things really hurts the levels as well. Sometimes you can break boxes and sometimes you can't. Unfortunately, the boxes that are breakable are usually right next to a bottomless pit. The spring placement is really faulty, as sometimes if you don't reposition yourself you fall into a death pit, while at other times, making any move whatsoever plummets you to your doom. Some death pits just don't make any sense, because I'll climb a hill, but it turns out the block I was ascending to the top of had a floor of a death pit. I found this extremely ridiculous at an area with a lavafall. Also, some times there's a bunch of enemies waiting to fight me (usually you can just skip past them with no problem, but sometimes killing them is necessary to go to the next room), while a few levels seem completely barren of enemies whatsoever, making the level a straight-forward "run along the path to win".
I've found time and time again some bugs in the levels, mainly missing or awkward textures, but also incorrect sector types. It isn't common, but sometimes I found myself touching a platform that was accidentally tagged a bottomless pit, and one other time I found a death pit that didn't function.
To summarize: death pits, lag, very poorly executed gimmicks and springs, a completely excessive amount of zoom tubes and camera shots that break gameplay, and a lack of actual challenge in the maps makes this entirely unenjoyable; it just isn't fun. I have countless suggestions on how you can improve your levels, but to put them into action would require entirely reworking the MOD. So, I have a much simpler solution:
Cancel it.
I once heard a saying that anything that's worth doing is worth doing right. Unfortunately, a shot at a MOD based off of Sonic 360 isn't worth doing, and you didn't do it right at all. Sorry for being blunt about this, but there really isn't any other reality to it.