Whoa!That art is sooooo AWESOME!Respect to author!
But,i think it don't fit to your game at all.(IMO)
Your characters/title screen have completely different design, while art based on Sonic OVA design.
I think, you should at least change sprites palette similar to that one on the art.Or change artwork to your character artstyle.
Don't get me wrong.Thats only my opinion
BTW,Is there any other works of this author?