Zenor

Just going to need a quick opinion on this one. There are 4 cacti there, two of two different shapes. Which one looks like it'd fit better when it comes to detail? I'm leaning towards the right one for the small cactus, but I have no idea when it comes to the bigger ones. It seems like one is too simple and the other is too detailed-looking compared to everything else. (This would probably fit better in an art thread, but I don't think only this much is worth one.)

We're going off-topic, but considering the Latin pronunciation of the word (which is the correct one), it's more like プロログス.

Proragas? Prolagas? What the hell is that? Either way, I'm quite sure the name he's planned to use isn't in Japanese.

That background is shaping up nicely, but I think you shouldn't limit its height to the screen height. After all, having it stick to the same place vertically at all times can get boring really fast.

I never called anyone a thief. It's just an expression to say that, while you might not have honor to someone unrelated to you, among your own group you might have. I'm not aware of who has done most of the art in the old games and I doubt they'll be aware of me, so I don't have hesitation when it comes to using their old resources. However, when that someone is very likely to be as we're part of the same community, I think it's better to hold myself back even if the work done isn't owned by him or her anymore.

Honor among thieves.

The sprites were done by Chimpo, a Sonic Retro member. Using these sprites would be like using Taxman's Desert Dazzle. They were done by community members.

To be honest, I get the feeling that his head, or maybe his face, looks huge. I can't really make a choice.

Oil is usually yellow and petroleum, black. You could also use purple like Oil Ocean. And the pink stuff was called Mega Mack. But Eggman doesn't use such things. He uses animals and flowers.

Past looks fine, but Future is far too gore-y for a Sonic game. A bad future isn't one where everything has been brutally killed. For that fountain, I wouldn't expect Eggman to replace the water with blood or some red liquid. Rather, I'd expect him to replace it with some robotic-looking structure resembling the fountain. You could use Palmtree Panic as an example to see that a proper bad future only needs an "abandoned factory" feel added to it. Hell, just the abandoned feel would already work. You're deviating too much from the general look Sonic CD's bad futures have if that's what you're aiming for.

That's really pretty. It's impressive how a simple color change makes the sunset feel so much more prominent and natural.

Done in my free time. It's nothing much as I don't really know what I want to do with it, and I think the only real charm it has is that the only thing there that wasn't done by me is the background. The whole thing was inspired by BlueFrenzy's Underground Base level which is one of my favorites. Still very incomplete, but you can see the kinds of structures I want(ed?) it to have. I got motivated to do this after I listened to Still, the level is all just blue and red, and I've been struggling to find a good enough color that isn't yellow to give the whole thing a better, lively feel. At least as lively as a final level can get.I've been thinking of greenish blue or plain gray.

I had a good dose of Crazy hairs when I was watching Shiki. Some of them were just "Hey, what's gravity?".

Damn, I really miss a lot while I'm away for some months. That Super Sonic looks great as well.

This is a fangame, not an official game. Don't push yourself to release dates, those things never go well. Take your time.