Hmm, I'm not sure what to say here.
Aqua Ocean act 1
The first act wasn't the best, but out of your projects, I can see where your improvements are incresing. A few things you can do here are remove death pit tags on water, they are annoying, second, try and not rush the level, take your time. And the thok barrier is screwed by the start, and allows Sonic to fly out of the stage. try and fix that, otherwise ok start, but it needs improvement. Also add some enemies, rings & hazards.
Onto Aqua Ocean act 2
It was slightly bigger, but again, not the best. It has more things in it such as enemies & hazards which is a plus side. But it was flat and bland, adn easy to complete. Put some more design into it next time, since again, too short.
Aqua Ocean Act 3
It's a boss stage. It was ok, but too small, and has no rings. You need to add rings for the player to collect when he/she fights eggman and incase if they get attacked.
Onto Sunset ruins act 1
It was bigger, but it wasn't too great. It was huge, flat, bland, and lacked in scenery in most parts of the level design. The rings are not deafed, and there was way too many red buzzes. Remove a few of them. The only good bit was the last bit.
Onto Sunset Ruins act 2.
Too short & bland. Come on you can do better than this. The beginning part is not a good example. Change the area a bit. There was quite a few enemies on there cramped in one sector. Spread them out a bit. And again, too short.
Overall: Truthfully, I'd give this a 3/10. Your skills have improved since the last thing I've seen from your levels, but again, you need to really concentrate on it properly. Also, you should revamp some of the levels because they were way too short, and not that great. Try and spend time on a level before releasing them to get better results. Although the plus side is how you used some of the textures in some stages. Use the srb2 wiki to help you, it did for me when I was making levels a long time ago, and still helps today. I hope this critisism helps you, it does have some small potential, but again, it needs serious improvement.