It was most noticable at the end in which Ray would pop back to being Sonic, and the credits text was a bit of a mess. Version 1.0 was released on SSRG on October 4th, 2019. Slowly over time, it developed more and more into the hack it is today. In which I showcased a video of an extremely buggy version of Ray's gliding. It should be noted that this is not a remake/continuation/sequel to FabChaotix' 2007 rendition of Ray in Sonic 1, this is it's own entity. This takes the Sonic Mania Plus incarnation of Ray the Flying Squirrel and puts him into Sonic the Hedgehog.
Ray in Sonic 1 is another simple character hack similar to ones created in the mid-2000's.