Ok, I know. It's a demo. But just a suggestion. When you fall you keep falling something about 3 or 4 times and then you back to the start. I highly recommend you take a look at this.
Also, not bad at all but please, create a "MUTE" button.

Good for a start. It was a tad glitchy. My suggestion is to give it a bit more time and effort. the music was alright. Honestly, it's a somewhat standard platformer. but as a demo, it was alright.

For a beginner, you're developing some necessary skills that are needed for making a good game. However, I do not think that this current version should be put up. It's nice to get a sense of what your game will be about: the general feel, look and gameplay. But this is far too short to submit as a finished product. I feel like with more time, you could create something good, even as a young artist.

Try implementing a mute button :)

NOT THE SOAP MAN, PLEASE!!~!!