Z to jump, arrow keys to move. Try to hit Robotnik on the glass! Tell me if it's too hard! Eventually the running part will turn into something where he somehow gets away and then you follow him to the next machine or something. The new battle isn't finished yet.
This game is going pretty good right now. Inspired by @PIGEON1qwerty with his Sorry my friends, but I couldn't resist... Sometimes it doesn't register a hit on Dr. Robotnik, workin' on that. I used Dr. Mack Foxx's piano redux tunes for the soundtrack so far. The second battle is a HUGE work in progress, FYI.