Hm, what are you trying to show us exactly. I'd be happy to give feedback, but with the version you give, it's basically just a character jumping and moving.
So.. I'll still tell you what problems I noticed, But there's no real gameplay (or I didn't find it?) so I don't have so many feedbacks to give you.
Your menu is.. argh.
It took me a lot of time to understand how to select a character.. Which is not good!
the "next" button is really little. And useless too.
Why isn't the game going to the next screen when I select a character, that would be waaaay more simple!
Also, I got a little bug. My character went litteraly in the sprite of the lvl. I was in the dirt thing. I don't know if it happens a lot but it happend the first time I played ^^
(and I'm not sure about those "flying platforms" in the lvl. It seems to be placed randomly, and without even thinking of "is it logic to have a platform here?". Weird.)
Anyway, keep working on the project, can be good with gameplay.