I didn't realize how much I wrote I already, so I just decided to put here my main points that I strictly want to say, in a bit easier on eyes fashion.
1. This stage has some nice exploration with items and secrets being hidden in plain sight. Which I specifically like. It's just so simple yet so smart.
1,5. My favorite secret in this stage is that a room with a reference to the 3 gargoyles puzzle, it was pretty neat. Kinda shows you how far you came in the stage since that puzzle.
2. The choice to get rid of lifes is a very good one. If you put all the ways you can die in this stage. (Oxygen, pit, damage and other stuff.) Along with the backtracking sections and the pretty high difficulty of this stage. Then it wouldn't make it the best experience if you also added stress of limited life's to the mix. (And I died in the moving squares room way [the one with the Armageddon shield.] more times than I can even remember, mainly when backtracking for the emerald which was extra painful.

)
3. The time emblem for this stage is absolutely brutal... the best time I got to up until this point is a 6:35. I'm glad that I realized that you don't need to specifically be in the record attack mode for the time to save because I would go absolutely insane with the fact that death in a run means instant end of it... (And my first RECORDED time on this stage was 30:31, excluding all the times I died and had to repeat sections. Which may mean that I spent maybe around 2 hours in this stage overall on my first time.)
4. I'm really surprised how accurate this stage looks to the original visually, I may even say that it's on the level of STJR. (If we exclude the sections that are just 1 to 1 recreations of A.T. -3-) I just really like how this stage looks, it's really well made on the visual department.
5. There are cages with fish throughout this stage, and there sometimes are extra life monitors in that small aquariums. And my question is there a way to access these? Or they are just here to taunt you with their presence.
5,5. This stage is actually so open-ended that I probably only experienced maybe 75% of it. I still have to find the emblems and check out what the deal is with the ring monitor replacements and the "almost all doors opened" thingy after beating the mirrored platforms puzzle. (Which also was pretty cool, but confusing at start because I thought it was an invisible maze and just completely ignored the platforms on the other side.) It has a lot of substance which I find neat even if I will never experience the rest of the 25%.
6. I really didn't expect arid canyon of all the stages to randomly appear, but it was a nice break from the omni-present aquaphobia... And in my opinion it wasn't that bad for a intermission section. (But my opinions tend to be weird, so yeah.)
6,5. I hope that if this map-pack will escape the demo purgatory, then it will get more intermission section like the one with arid canyon. (And I like temple themes so another reason I look forward to the uncertain future of this map-pack. I wonder if the next stage would be similar to aerial garden.)
7. With this stage reusing the stage theme and some sections from Azure temple, it makes it feel like sort of a DLC or a different unknown path of the original stage seeing how it ends in the exact same place. Pretty cool concept if this was the intention.
8. But the only single thing that I don't like that much is the backtracking section for the green emerald. You have to go one time for the emerald and a whole other time to get back to where you were, and if you so happen to die (which is pretty easy with the moving stones section.) you have to do all of that again. You maybe could add an opening with a brand new section after you collect the emerald? (or bonk the sector the emerald used to be at. :P)