Looks like so far you have a couple pre-levels and then a 1-1.
If I were you I would have made more progress than that before a topic, but there's no going back now!
Seems a bit bland but a very good start nonetheless.
May I advise you try to use some custom graphics
to spice up your levels. Adding coins, background objects and making levels interactive are also some things to consider.
I'd sooner educate a newbie on design before CGFX as it builds better potential for great levels. Also, if you're a smart person who continued reading after Bryan's post, be a decent person and don't fill this topic with posts bashing him for suggesting GFX. This is 2015, not 2013.