Baba Is You by Hempuli

Baba Is You is an award-winning puzzle game where you can change the rules by which you play. In every level, the rules themselves are present as blocks you can interact with; by manipulating them, you can change how the level works and cause surprising, unexpected interactions! With some simple block-pushing you can turn yourself into a rock, turn patches of grass into dangerously hot obstacles, and even change the goal you need to reach to something entirely different.

You can find the OST on itch: https://hempuli.itch.io/baba-is-you-soundtrack