Now here's a lovely little puzzle game that's also hard as nails. It features a cool, minimalistic soundtrack by Arvi Teikari, which you can buy on Steam.
The idea of the game is to shuffly words and objects around; usually you'll start with a 'Baba', 'Is', and 'You'. Replacing any of the nouns can result in switching the controls to the words or objects that are in the sentence. For instance, you could make 'Baba Is Rock' which will a rock the controllable sprite instead of the player sprite.
Check out the game and the soundtrack!