I think it's a fine game overall, a really fine one. The concept of a spacebar as the only control's interesting, and it lead to some moments where I really had to think about my movement, but it also lead to frustrating moments where I just couldn't get the jump, or where I kept dying. I think that can be remedied with either a looser control or perhaps less hazard? At least not at the beginning.
Overall, with the music and visuals in mind, as well as the bubbly atmosphere, I liked it!