First off, I love the sound design. Everything you do has a distinct and unique sound that rewards you for each press of the button, and they even feel as though they fit into the music which is equally fun to listen to. Second, the implementation of "Light and Dark" was very cute and outside the box. My only issues were
1. No in-game tutorial, I had to go through trial and error of figuring out the controls as well as understanding the game mechanic. After I finished the game I saw the tutorial in the description- you can't always rely on your player to go out of their way to read those things!
2. The "hourglass" coffee was confusing as the white sprite was different from what the actual coffee displayed, so again I had to learn through trial and error.
Other than those two things, I had a great time with your game. It was nice and challenging, even with a simple concept! Great job to you, this one definitely stands out!
-Edit
Just realized, you are the roast master, I am the thrust master. Together, we are unstoppable. Interplanetary Cafe coming up next!