'Game is wonderful with the Sonic-esque aesthetic, however I do not like the way the movement and jumping is. Since I've learned through reviews that this is a demo even though you have not stated it as one (which you very much should state in order to not unintentionally mislead players), consider changing the way the movement and jumping is.
P.S: Don't take anything the past reviewer said to heart, you're game is as I said, very wonderful. I don't see any blurriness in the sprites at all.