I realise this was just the demo, but the movement was slow, and falling off the cliff results in endless punishment. If you sped up movement, added more interaction, and maybe made a movement animation (possibly rolling) this game would be more enjoyable.
OK, What is this? I'll give you points for the sound and background(=1/2) but other than that, it's just a platform- no a green platform. Plus it's a demo!