Nice game, I really like the idea of avoiding the asteroids instead of downright shooting them, and the items gives more incentive to put the ship at risk (although I still don't know what they do exactly, since my score increased automatically. Is it fuel ?)
With that said, I think you didn't play much around the theme, "Only one". You respected it, but I think it would have been more interesting if you used it as a tool to enhance the gameplay instead of a simple constraint. I can't really explain well what I mean, but in short, using it as a means to incite the player to achieve a specific objective, or something like that. But overall, it was pretty fun and i love the aesthetic, so it's a plus in my book :)