I agree with Draykon here, the visual design is stunning. I never thought I'd see realistic textures in SRB2 have a real use outside of straight ports, but you've proven me wrong. Your in-world, grounded level themes seem to be inspired by extremely generic, very American locales which lend themselves to being very unique and unexplored level themes. The biggest issue with this pack is how unclear some of the paths are. I love that you adjusted vanilla enemies to fit the aesthetic, albeit it's really odd to see Sonic, cartoony ever running through these places, but I can get over that.
Lawn World Act 1 is as simple and sweet as ever. I still enjoy it, it's a unique stage that sets the feel of the pack well.
Lawn World Act 2 starts to move into this pack's biggest issue which plagues this stage and especially Broadside Cliffs. Despite the stage looking good and the platforming being okay, your directioning is awful and I found myself getting lost or stuck for minutes at a time in areas.
Lawn Field was an extremely refreshing NiGHTs stage. Good job, I have no complaints with it. It's very pretty in its architecture, it's easy to keep a chain and the objects are well placed. It was very refreshing for me after the headache I got trying to complete Lawn World Act 2.
Lawn World Act 3 hitscan lasers are bullshit. Getting Eggman into his pinch phase as Amy or Fang is a guaranteed hit on you as you have no horizontal mobility options to get out of the way of his hitscan laser in time. This boss really doesn't need to exist.
Broadside Cliffs Act 1 is such a unique level style I never thought I'd see in SRB2. This sorta badlands military camp aesthetic is really cool. There are some big issues though.
A lot of the paths are extremely unclear. It took me 20 minutes to figure out how to get onto those boxes in the Overview post. That path is so ridiculously out of the way it's not even funny. Looking in the water was a last resort. It doesn't even LOOK like a path from above, and there's no way you're gonna fall in there by accident either. It's an extremely obscure path and it made me kinda angry.
Masses of those multihit military grade crawlas also got very annoying very fast, especially when slowly trying to kill them. You should place less of them. Object placement is a huge issue in this stage. I think the most egregious has to be those TREES. They're big, they're solid, they're very easy to run into and they block your vision in third person. You place a lot of them on thin paths which makes it impossible to see ahead and very easy to run into, completely stopping you dead in your tracks.
I can't send a gif of it here but later in the level I swear I found a softlock. I'll show you on discord if I can find where it is again.
Your music choice also was very grating after a while. But it fits the stage theme I guess.
Skyward Garden Act 1 is your best stage, hands down, holy shit.
Why didn't you submit this to the OLDC? It would have placed very well if I had to guess. This has to be the most well made Aerial Garden styled stage to date. I loved it the whole way through. It didn't suffer any of the directioning problems the previous stage did, the music choice was great, and your decoration and architecture was very interesting. My biggest complaint is that those aggressive ass Blue Crawlas were very frustrating as they would blindside me at mach 3. You should place less of them, or change their movement a bit.
I can't wait for what you have in store for Act 2. If I had a suggestion, don't make it more of the same. Act 1 already serves its purpose very well, and Act 2 being the same as that would make it drag on and feel less special. I'd recommend giving it a thematic shift, adding more story and climax to it. Be it a big thunderstorm that happened, or Act 2 trekking one massive palace that arised from the sky after Act 1. Or the garden falling apart, etc.
Also you should really submit your stages to an OLDC. They're starting to become very high quality, and submitting a stage to the contest ensures that most of the community will play your stage and leave feedback, as opposed to a lot of people ignoring a standalone release.
Anywho, I quite enjoyed this and I can't wait to see more from you. Good job!