Yes I make one simple just to run from over complicated scopes XD.
Some tips that I think that can help you.
You probably need a few levels in beginning as tutorial, like the firsts levels of the NC20 game, like, just 2 buttons of walk right and left, a timed level of a shot with just right and jump, the atual levels are good, just the first one that can be complicated to a new player to understand what to do.