Good - loud, but good!
Lower the volume of the music, that would help a lot! :-) But I do like this Sonic scene creator, it's fun to play around with making different Sonic game scenes (some of your other reviewers clearly aren't artistic, are they?), it's got plenty of items to use. Try and organize it, make the sprites re-spawn rather than have so many of each one, add some other background choices and some other music choices - you've already done all the hard work creating the game's functionality, if you put in the extra bit of effort you'll have a real winner on your hands.