Your game is not so good then the original .I like the graphics .
The game will be good if you will continue with more levels .Look for exemple you could also add and a doomsday zone (into space )with super sonic (Ok don't copy all the levels from clasic sonic games).I saw that you didn't add the sonic's spindash .And by the way the timer ,at your game is counting down while at the original games sonic the hedgehog 1 2 3 sonic & knuckles they are all counting up . And you can add also and mecha sonic if you will ever do the sequels.Your game dosen't compares with the original sonic the hedgehog . Good luck on making full version or the full sereies if you will ever the the sequels.