Walk around using arrow keys. Interact with stuff by clicking. There's a day-night cycle which influences the situations of NPCs and availabilities. And I'm sorry, you can't race. :(
I swear I made assets for the ring icon and the race stuff, but then I accidentally replaced the project with the previous project file. Oops. This project was made back in summer of 2017. However, I stopped working on it. (If this is interesting, I can go back and finish it.) Sonic and co belong to SEGA (Too lazy to give music and sprite credits)