Thank you! You mean to open the menu? It is not really required, and you can also click on the sun and drag the camera around to see the menu.
That's fair, I also mean more generally though. I feel that often Sokpop games however awesome they are you have to infer what the controls are. As someone who'd never played old console games, pressing zxc randomly and it working surprised on occasion until I got used to it. My general preference is that spelling controls out for your grandma is better even if you're not designing a game for your grandma. This is my opinion of course, so up to you. (great game still :D)