NN81 it's a good start - there might no feedback because your platformer is like any starting project here.
Everything is done solid - the control, the gui, the sounds - the artwork is a mix of 2D and pseudo 3D - this didn't fit together very well but it's OK so far.
Also the leveldesign is a nice start but there is nothing to keep the players playing on or play again.
Gamedev and leveldesing is a bunch of hard work - and to attract gamers (especially us from the forum [nearly all here create games]) you have to create something special.
Something unique in art, design and/or concept - and even then most of us just take a little look and return to the own project.
My advice is play games the type you want to create - e.g Super Mario, Sonic, ... and take a look whats good and whats bad - take the good (and add some cool new features) and build a game you like to play.
Tell us whats special (or let the game show the cool things).
The most important thing is you have fun to create your game - there a zillions of platformers and other games - do not expect too much feedback.
Again it's a nice little game you've created but - like Cryttexx already said - keep on working and make it