itch.io

I'll try to be cute and not say the exact controls / steps, but if you want to know specifically how to play it, just ask in another comment and I'll tell you. The game explicitly doesn't tell you how to play it because of the "Confusion (how badly do you teach your mechanics?)" rating criteria for the jam. All the NPCs give you very roundabout hints on how to play, but it's intentionally very poorly explained.

The progress through the 1st level (out of 4):

1. You must do the right thing and save all the animals
2. You must save Amy
3. You must confront Black Yoshi and not die
4. You must get help from your good friends
5. You fight Black Yoshi
6. You tell Sonic that you saved all the animals and follow his advice