(This is based off the initial demo. I have not had time to try this "NEW AND IMPROVED!" demo)
I really don't know where to begin with this.
I think you should have skipped SAGE altogether as what you've put out so far is an incomplete project that fails to show whatever you had envisioned. The whole point of a demo is to get people interested by showing them a small taste of what the game has to offer. This demo has showed nothing other than some pretty visuals and okay music.
Visual wise, this game is pretty good. Lovely foreground, okay backgrounds, and some nice revamp art for Sonic with an okay Metal Sonic which is obviously WIP. (Signpost is hella ugly though.) No real complaints graphically.
The music is "okay". Nothing wrong with it, but it's not exactly inspiring or something I would like to listen to while playing a video game. There's no real catchy melody playing throughout the song so it's mostly forgettable. Sound effects are borrowed from other games so I won't comment on that.
Level design itself however, is pretty horrid. It's just a bunch of downward slopes here and there with some walls that stop you from advancing after you build up speed from these slopes. Sonic has one hard as hell time getting through those loops, even after building up momentum, and some of them are just placed in some pretty pointless locations. (The one on your website's screenshot for example.) It's not fluid at all and I hope you take a look at it.
By the name implied "Gemini", I was hoping to see some actual use of your main gimmick here. Unfortunately, I am left with nothing. Actually, that's how I'm left with this demo. It's just Sonic and his useless counterpart going through a boring level with nothing to do. No enemies to fight, no real puzzles or gimmicks to overcome, nothing.
On top of this, the game suffers from some serious performance issues. There is absolutely no reason why I should be running this at 30fps. I'm not playing Crysis here, I'm playing a 2D platformer where the only two things I can see are rings, Sonic, and Metal. Not to mention the numerous bugs I've encountered such as losing control entirely if I run too fast and hit a wall, animation screw ups, and collision detection. The partner A.I is pretty awful on top of that, even worse than Sonic Advance 3's stupid asshole buddy that hit things you didn't want it too.
Obviously you could have much more in store for the future, but so far this demo shows absolutely nothing. You really should have held off from SAGE and released a demo when you actually had something to show, otherwise this has left me with a dry taste in my mouth. I seriously hope you guys have something to show for next time you release a demo, because right now it's a pretty lackluster game.
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