A fantastic game, a wonderful time despite me taking forever to finish it.
I love how silly this game is. Peppino is funny, the levels are funny, the other characters are funny, and doing things like shooting animatronics in the face with a shotgun is hilarious. I had such joy and whimsy going through each level in this game.
Speaking of the levels, the gameplay in this game is so fun. It's basically Sonic meets Wario Land and it's a blast. It was a bit hard learning (and remembering) all the moves you could do in the game, but after getting a feel for all of them traversing the "Pizza Tower" was a blast. I like all the levels having unique gimmicks and the bosses were fun and challenging. I still haven't gotten every treasure, but I definitely plan on doing so (maybe even the secrets as well).
The music is also fantastic. I especially love the final boss theme(s). Although, really my one main complaint is that I really really wish that final boss that checkpoints. It made playing through it all over again a pain.
What else is there to say? Wonderful game. That's it.

An okay game that I liked the idea of more than actually playing it.
Not much to touch on in story (I also didn't play the first game) so most of this is on the gameplay. But before that, I want to say that I really enjoy this game's art style and general style. I've always liked the 3D on 2D sprite aesthetic, so I very much like how the game looks.
The gameplay here is about where my thoughts probably get controversial. I'm just not a big fan on how the game plays. The character selection is the same as in Sonic 3, except from what I can understand, more pros and cons to each character. Sonic is the fastest but can't do anything that Tails or Knuckles can do, Tails can fly and is the easiest character the play, and Knuckles is the strongest, can glide and climb, but is slower. Something that is also to note is that he finds hazards the most difficult. The Sonic & Tails combo is how I played, and I quickly realized not only what they meant, but a bunch of other problems on how it played. Basically, Sonic is a little too fast, can feel slippery, and therefore makes platforming and general traversing around the zones difficult. It's not a problem with big open areas, but becomes too much of a problem when you're doing literally anything else. Jumps are hard to make, and the Speed Thok is much too powerful sometimes to keep you on track and it led me to falling down pits often. It's also a little hard to hit enemies, and while there is a lock-on feature available, I feel like it just would've been better if they had just added a homing attack instead, which is something Sonic basically needs in his 3D games. This was my main problem with the game, and when I wasn't having fun and traversing the worlds, I was struggling with making jumps, controlling Sonic, and hitting enemies. The bosses are okay I suppose. but sometimes you just need an invisible wall or else you're going to fall off the arena, which is just annoying. I am very grateful to be able to fly with Tails because I very much abused it during the final zone filled with many moments where I thought "they really expect me to do this". It was fun and it was not.
Although, the game does have great music. What's a Sonic game without a brilliant OST? It definitely made playing through the game more Chill.
Overall, I didn't want to be harsh in my review because this is a fangame created by a few people being made over literal decades, and it still isn't technically done. But that still doesn't mean I wasn't frustrated or annoyed more often than not at the controls. It also did not help at all how the camera made me motion sick, so while I was playing the game I was also feeling sick basically the whole time. I would like to see the game improved, and I appreciate all the people working on it too, even if I personally wasn't a fan.

It always felt a bit off but it is very fun and well-made.
What exactly I mean by "off" would be the game's style and theming, being very gloomy and dark compared to the bright and vibrant original. It was an interesting direction to take for a cartoony platformer, and it isn't bad, but I had to have the brightness up while playing. Not only is that different, basically no characters or ideas return from the original game. They're "replaced" (some will return in later games), by series staples like Globox or the Teensies. I prefer this, I found all the other "Ray"-people in the first game to be weird.
The gameplay of this game is essentially the first game but in 3D, and also if it was actually fun! The biggest welcome would easily have to be collectibles not being absolutely MANDATORY to finish the game. There are 2 collectibles: Lums and Cages (returning from the first game). You do need a certain amount of Lums to progress through the game, but not every is necessary. As for Cages, Most of the game there is at least 1 necessary, but that one is almost impossible to miss, and if you do collect the extra cages, you can get an increase to your health, which is always nice. These changes relaxes the player way more because while not HAVING to get every collectible, it is definitely encouraged to get as much as you can throughout a level, and hopefully you don't have to replay them. I didn't talk much about the actual gameplay, but it all feels nice to play. I don't like some of the level gimmicks however, I'm not a big fan of the plums, for instance. The final fight was also bad, in my opinion, I think their should've been a checkpoint for each hit you got off of the pirate leader (whatever his name is).
The music has some sort of feel. I'm not sure how to describe it. I suppose it was good, and it adds to the strange atmosphere of this game.
It's been 2 years since I played the original Rayman, so it was nice to play and actual good Rayman game after all those years. This is also technically the first Dreamcast game I've ever played, because apparently it's the best version of the game. Hooray for the Dreamcast!