Make it more like Sonic, I guess! I've grown to prefer more momentum-based 2D platformers like the Genesis Sonic games, Fancy Pants or Rayman Origins. But that's just me, I like 2D Sonic more while Mario dominates 3D platformers for me, I'm sure there are other people that would think differently.
MrPurpleMrPurple
So I really liked the first one and am glad to hear you're doing a sequel, all I would say is maybe different aesthetics for some of the levels. Like maybe a change in music or scenery for some of the stages. Either way I'm excited to see what you come up with!