I like the minimalist pastel graphics and the sound. Definitely could do with a bit more to it, as someone else mentioned, and making the player press a button or click before starting after a death is really essential here. My character's died dozens of times while I've been typing this.

Also, for some reason, the character being too far on the left is getting to me. Maybe it's because this means you're about to die in other side-scrollers, so I'm getting subconcious stress!

I mean, the game definitely works, but it's a bit too simple. The sound effects get quickly annoying and while the music isn't bad as such, I think you could have chosen a better track if your goal was to make something relaxing.