After playing through a bit of the beta, I encountered a couple things that I thought was worth sharing.
The placement of Knuckles in green grove act 1 makes you collect a ring after completing the stage, but since you're close to him you deposit the ring. This isn't a real issue, but just something I thought I'd add in case you want to polish it.
Also, in Green Grove act 2, the placement of knuckles means that, after doing the special stage, you will have no rings and will most likely run into the nearby mine. This is somewhat of an issue, since you most likely got the emerald in act 1 and your reward for doing it again is an extra life. Losing that extra life right after getting it is a bit of a bother.
I understand that it might not be easy to find good placement for knuckles without him becoming glitched (like jon showed in his videos) but if possible I'd like to see it changed a bit for the better