First off, love the name of your game, very big brain. Also, I thought your overall graphics and color scheme was very pleasant. The levels were also fun as well.
A few minor improvements: I maybe got stuck on the second level? I cleared all the enemies including the blobs and squares, yet the level didn't end. Also, your use of dice somewhat felt more thrown in, rather than being incorporated in to a theme. Perhaps orienting the whole game around the idea of dice or making the enemies even dice themed would have really tied it all in better.
Besides those super small suggestions, I really thought you did well with your game! The gameplay was clean and the simple menus and ui was easy to navigate! Great job!