Got a 19! Though, still no where near the World Record... yet...
As you mentioned, there are things one could add if given more time than only 48 hours, but I think the game delivered as much as was needed, if not more. I found myself playing through a number of times so it's obviously satisfying, there's replayability in getting a higher score, and I really liked the art too.
Like some others I found I didn't use the jump really, I just preferred the uniqueness and skill of the launch (and you could use it midair too), but perhaps if the jump didn't require you to be moving already I would've found it more useful? Might just be me. Either way it would be cool to see you come back to the game!