The ui is gorgeous and works really well for the most part. The sliders are a bit wonky, but functional. Really neat that you pulled that off with bevy_ui though. It has come a long way, and bevy-ui-navigation is a great crate.
I went through the formulas screen first, and it was nearly incomprehensible. I get the gist now after attempting to play a bit. But having all that right in my face immediately left me feeling pretty hopeless.
It's hard to find a happy medium for the keyboard controls, and I was a bit bummed that when I found a value I liked the game didn't persist that setting. I accidentally exited the game more than once while navigating menus. But that setting existing, and being able to test it in the settings menu are a great touch.
I was hoping to make it to 30 seconds but I am not good at these things, so I think 25 will have to do.