I changed red into sonic Cursor Keys, WASD or touch (mobile) to control sonic Collect all the rings to open the end portal. Enter the portal to complete the game. This engine supports a lot of fun stuff - well... play the level to see! But there is scope for much more than this :). Want more levels? :) - How easy was this first one? and what was your time? Anybody suggest some nice background music for this?
this is a prototype of my scrolling sonic game