If y'all got any good game recs from SAGE 2018 I'm all ears.
I already played through Sonic Chaos, Islands, Advance Revamp and Petit Hedgehog.
Cosmic Eternity is another good 3D game concept. Not as polished as Sonic Islands but it has potential.
Sonic Adventure Blast is a cute one to try if you like the Sonic Adventure games but it's very early in development and while there are loads of levels, most of them don't have actual object placement yet. All of the levels are ported from other games too (mostly SA1 and SA2 and some Nintendo N64 and Gamecube games).
Sonic Ages is a 2D game with a handdrawn, Sonic CD opening-esque sprite for Sonic. Sonic's animation is beautiful and the physics feel good, but the level design feels bland right now and is clearly unrefined.
Sonic 06 Remake is impressive for how accurate it is to Sonic 06 and the Crisis City demo for this year's SAGE has graphical improvements compared to previous demos.
And it's not a Sonic game but Crash N. Tense Adventure is supposed to be really good. I have it but haven't tried it yet because it won't detect my controllers, but otherwise I've only heard good things about it. It was popular last year too but this year's demo is different.
Besides that, there are demos for some Sonic Mania mods I've heard are promising, the Sonic Mania: The Misfits Pack.