You downloaded a strange 3D Sonic game with Sega Saturn style graphics from Gamejolt in your computer to test. The description in the page was strange, reinforcing the idea that this supposed game was old and had been recovered

While you was playing, the game didn't seem like anything big. Just a silly children's game about playing games with Tails, Knuckles and Dr.Robotnik in an small open world controlling Sonic

At a certain point of your gameplay, Sonic simply stop to obey your commands and turns towards the camera, facing you directly

"Hello!" Sonic says, that is weird...