A dumb concept for a game.
Now, I like platformers as much as the next guy, but when the very essence of the game is broken, and its main point being something so overworked, overdone and mundane, it's safe to say you've made a shitty game.
As I said, the platforming element of this game, which is the ONLY interactivity this game offers, is absolutely bullshit. It's about as responsive as Super fucking Mario. Except in Super Mario, you get the thrill of powerups and fucking shit up, along with avoiding obstacles, but here, all you do is fucking jump on shit and hope that the brokenness of the game's very physics system won't make piss you off.
I liked the visuals yeah, which brings to me another point. You seem like an able animator, so why not instead of giving the viewer a bullshit 'cinematic' experience, you actually make a movie next time? I'd definitely enjoy it. Basically a run through of this game, but with more fluid walking and jumping animations, and a dynamic camera. It'd definitely be a decent watch instead of a shitty, shitty game.
But if you intend on keeping this shitty game mechanic around, I have some recommendations.
Don't waste the pretty visuals by treating players with shitty animation. My advice is to try to model your code after the one in Fancy Pants Adventures. Like make the player character's jumps feel more weighted, make him pick up speed, so he goes from a jog to a sprint, but the option of keeping his movement slow comes by pressing a key while pressing the arrow keys. And another thing, this goes A LONG WAY to making this a better overall experience.
Add sound effects! Footsteps, panting, grunts, billowing smoke. Like when you enter the urban looking areas, the sound of traffic fades in, and it fades out when you leave it. The wind should cry as you walk across the clouds, and when you walk across them, try triggering like a puffing effect to make it feel like a real cloud instead of a brick. And make the blimp more reactive when you walk across it.
So yeah, that's pretty much my thoughts on this game. I didn't enjoy it, but if you take my advice you might be able to make a better game next time around.