Interesting tech demo. I couldn't make my PS4 controller to work on the game. It works fine on other games, so I don't know why...

Didn't tested it much, but my feedback would be to remove camera acceleration. It is quite wierd.

Movement is mostly fine, but needs a bit of tuning. Aiming at jump pads and enemies works, but air velocity is a bit too much. That would be fine, but air control is very tough - especially visible on the platforms at the edge of the map.
Spinning is good, but feels just a tiny bit slow - and it shouldn't probably last that long - sonic keeps spinning when the velocity slows to a crawl. I'd say the same for actually running - final speed feels good, but the gain is a bit too slow for my liking.

And at last - it feels like you slow down at the peak of a loop, as if you're using actual physics and not sonic physics.

Overall - it's a good start, but needs polish.

Super solid foundation, really my only complaint is that Sonic doesn't move as fast as I'd like.

The feeling of speed in this game is really great. The spindash feels off in some way, but it was fun to play around with, going off ramps. I don't much like the camera following you on loops, purely because of visuals, but it absolutely helps you, the creator, create proper and accurate loops and all, so you could definitely do cool level designs with that.

Really great player movement so far! 

Pretty cool controller already!

I think you need to make the camera leveling to horizon while standing unmoving on a slope, otherwise it feels like a gravity change

Physics and gameplay seem really good for just a "Shitty Game"!

Just be careful of tilting the camera left and right, it can easily cause motion sickness. I'd also delete camera acceleration. Rails also don't seem to work. Otherwise, pretty dang good!