First of all, I'd like to say I love this mod, its pretty good and fun to play as well as try to 100% complete it, but since this is a demo, I'd like to give some suggestions for the full release. Please don't think I'm being rude or that I'm saying that the addon sucks or something like that because I'm not, just trying to give some advice and please forgive me if at any moment I sound rude.
In the first level, whenever you try to roll down a slope, it kills the momentum making you slow, this can be a problem for there a far to many slopes which makes rolling the only way to go down faster; I also suggest you fix the camera during the loop-de-loop animations, all you can see is the road and, while it's not a problem, it could be better; I'd also like to mention that Sonic doesn't move much when doing a mid-air boost and makes it barely noticeable; there is also a problem with the dash rings where they glitch out, putting the bottom part on top of the other, this could be troublesome, for you can barely notice the rings and might miss them by accident; another thing to take into account is the truck phase, it would be pretty cool if you could change the camera to face backwards while in this phase to get more of the SA2 experience; other than that, Sonic's level is pretty good. Now on to Tails, while it seems it was intended, removing Tails' fly with a glide seems awkward, for there are times when you have to shoot the Beetle's, lowering you speed and making you fail the glide, this can cause unnecessary deaths and potentially annoy players; another thing I noticed was that at the beginning, there's one more Beetle on top of the players in the back, literally no one would think to check that since the game is forward based, and there's no need for a platform since Tails can still defeat that Beetle by facing up or just jumping and shooting; now based on the platforms in the stage, they are barely noticeable and while you could get the idea of going to the top sections of the stage, there is no way of knowing where the platforms are because they blend in perfectly with the stage floor; but the level is good non the less. Next is Knuckles and there are many, but MANY things to fix here. First of all, not giving Knuckles a role but instead a sort of dig function seems both useless and confusing (no offense), the dig has short range and can't even be considered a dig if doesn't go underground; it would be very helpful to fix the time emblem for it is impossible to clear this stage in less than 1:30, the stage is humungous and the shard radar has such short range, it took me 5 minutes to find just one shard witch sucked imo; another thing to take into account, and don't mean to sound rude here, but the chao box locations are stupid and unreasonable, nobody is going to check the bottom part of the stage just to find a chao box, who would do that when the stage is huge???; while I like Pumpkin Hill Zone, there is a lot of room for improvement here, but the design is peak and makes me remember of SA2 in many aspects. Now Rouge, not many problems since it's basically the same as Pumpkin Hill but what's worse is that there are too sections, one above the water and another below the water, this makes you think there are two levels in one which is kind of confusing and all the more reason why the time emblem will be impossible in to complete in this zone as well; not something that's of high significance but Rouge's sprites are kind of old and could use some remodeling, if it's possible to make an addon specifically for this one that changes the old Rouge sprites with new ones. Now, Eggman, and oh boy are you gonna hear from me. To start things off, I'd like to mention that in the beginning of the stage, as well as the final parts of the stage, glitch out in the center view of the camera, making it barely possible to see what's ahead, you would need to look at another angle in order to identify the area ahead of you, this can a waste of time when doing the time emblem, and depending on the ring emblem, you won't be able to see some platforms as well as some Beetle's which could make the player wonder, "what hit me?"; also, like everyone knows, SRB2's platforming system has many steps to follow, and clearly, this addon doesn't follow them correctly. When ending the moving animation, platforms usually stop so that the player is able to react and board the platform without failing, this is not the case, for the platform doesn't stop when ending the moving animation, making it hardly possible to board, you would to build up a lot of speed and take off at the right time in order to successfully board it, the stage has many moving platforms which makes this all the more annoying to clear, not to mention that the final part of the stage has up to THREE MOVING PLATFORM LANES!?, this section is utterly disgusting and very hard to pass without dying (again, no offense); I'm pretty sure this stage is the least favorite for this addon by many players but that makes it all the more challenging and satisfying to clear, tho it could use some improvements. Now for the final level, Shadow, not the worst but not best by any means. Like City Escape, Radical Highway is way too long and the timer emblem doesn't disappoint, but there are also sections where it glitches out in the center view, making it hard to notice obstacles in the way, and while you can fix this by facing another angle, it's a waste of time when doing the timer emblem; I also get why you added a bounce to Shadow but it's not very helpful, OG Shadow already had a way to gain height but it would appear that you replaced the upward Chaos Control with the Bounce mechanic, while it's fun and a unique ability that hasn't been implemented to Shadow recently, I bet that most people didn't notice this because there is no reason to use spin in mid-air when this was never added to his addon, because if you know OG Shadow's moveset, you're able to notice that this isn't a necessary addition, plus, sacrificing one Chaos Control and the upward mechanic just doesn't feel right and makes you have to get used to this version of Shadow with a "not-so-reliable" kit; other than that, it's the same problem as the camera in the loop-de-loop's in City Escape and the momentum problem with slopes, but Shadow is fine; and also that at the end of the stage in the stage clear animation, the camera goes out-of-bounds, which isn't annoying but awkward. I'd also like to mention that the Chao boxes don't have any sort of special addition because there is not Chao Garden in Story Mode, it would be very cool if you could add that as well. This addon is great and I hope that when the full version releases these problems could get solved in order to make the SA2 experience in Robo Blast a whole lot better.