Pretty Alright for a demo, although some things need to be polished like the character staying idle or the gravity with its slippery ice like platforms, try a little bit harder next time, good luck!

Not a bad start of a game. The physics are a bit "floaty" though. And you can stick yourself in a wall if you jump against it. Not sure if that's a feature or a bug.

Very good for your first game.
I can wall-jump what feels really unnaturally, maybe try to enhance movement to feel more good as you move, as this is main thing in platform games (i think :)
I mean - do not change movement when in air - only go a little slower, or jump lower etc.