Design is great. Its polished and the music helps with what is happening in the scene. But only one button doesn't help with the game's mechanics. Its like a way to escape the theme without having to actually incorporate the "only one" theme in an original way. Many games only have one button to press especially mobile games. If pressing one button qualifies for "only one" like in this case where it only controls height flappy birds would count too. I think game jams should try to use the theme and incorporate it in a meaningful way that changes the mechanics opening a new door to a better more original game. Not saying the game isn't fun but I've been finding it hard to find games for this jam using the "only one" theme properly.